22 (number)
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22 | 20 | 2 |
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22 (twenty-two) is the natural number following 21 and preceding 23.
Cardinal | 22 twenty-two |
Ordinal | 22nd twenty-second |
Factorization | |
Divisors | 1, 2, 11, 22 |
Roman numeral | XXII |
Binary | 10110 |
Hexadecimal | 16 |
Contents |
[edit] In mathematics
- Twenty-two is a composite number, its proper divisors being 1, 2 and 11.
22 is the sixth discrete bi-prime and the fourth in the (2.q) family. With 21 it forms the second discrete bi-prime pair. 22 has an aliquot sum of 14 and is the fifth composite number found in the 7-aliquot tree. It has a 7- member aliquot sequence 22,14,10,8,7,1,0 of which the next two members are themselves discrete biprimes, 22 is the first discrete biprime exhibiting this property. 169 also has 14 as its aliquot sum. 22 is itself the aliquot sum of two numbers 20,38.
- Twenty-two is a pentagonal number and a centered heptagonal number.
- When cutting a circle with just six line segments, the maximum number of pieces that can be so created is 22, thus 22 is a central polygonal number (see lazy caterer's sequence).
- The sum of the totient function for the first eight integers is 22.
- 22 is a Perrin number, preceded in the sequence by 10, 12, 17.
- It is a Smith number in base 10.
- 22 divided by 7 approximates the number π, the ratio of the circumference of a circle to its diameter.
[edit] In physics and chemistry
- The atomic number of titanium
[edit] In astronomy
- Messier object M22, a magnitude 6.5 globular cluster in the constellation Sagittarius
- The New General Catalogue object NGC 22, a spiral galaxy in the constellation Pegasus
- The Saros number of the solar eclipse series which began on -2192 May 17 and ended on -912 June 23. The duration of Saros series 22 was 1280.1 years, and it contained 72 solar eclipses.
- The Saros number of the lunar eclipse series which began on -1944 January 23 and ended on -592 April 12. The duration of Saros series 22 was 1352.2 years, and it contained 76 lunar eclipses.
[edit] In religion
- There are 22 letters in the Hebrew alphabet
- There are 22 chapters of the Revelation of John Bible
- In the Kabbalah, there are 22 paths between the sephiroth
[edit] In numerology
- The number 22 is significant in many systems of numerology, often called the Master Builder or Spiritual Master in Form. This 'master number' includes all the attributes of the number 2, twice over, and also those of the 4. People who are 22s are said to find themselves feeling as if they live in two worlds, one which is overwhelmed by the mundane, and the other by the fantastic.
- In the divinatory Tarot, there are 22 major arcana cards. These cards are numbered 0-21, so it is a matter of interpretation whether The Fool or The World is card number 22. The latter card is almost always associated with hard workers, a red-gold colour, and a rose-gold gemstone. Interestingly, the digital root of the 22 is the 4, which is the number of hard work.
[edit] In sports
- The number of players in a rugby union squad for international and other top-level matches. Seven of the players are "on the bench", ready to play as replacements or substitutes.
- Also in rugby, the "22" is the line dividing the field into quarters, which has significance in a number of laws particularly relating to kicking the ball away. It is 22 metres from the try line.
- The number of players on the field in a soccer match
- The number of players on the field at any one time in an American football match
- The jersey number of retired NFL running back Emmitt Smith and retired NFL running back Mercury Morris.
- The retired jersey number of NBA players Clyde Drexler, Elgin Baylor and Dave DeBusschere
- The jersey number of former Syracuse lacrosse stars Gary Gait, Charlie Lockwood, Ryan Powell, Casey Powell, and Mike Powell.
- The jersey number of Brazilian soccer player Kaká at his club AC Milan.
- MLB pitchers Mark Prior, Brad Radke and Roger Clemens wear the number 22, and Hall of Famer Jim Palmer also wore the number.
- The length of a cricket pitch is 22 yards.
- The jersey number of Dino Ciccarelli, retired NHL player.
[edit] In music
- The name of a song by punk band Millencolin
- The underground-produced song, "twenty-2", which has continued to gain popularity since its debut release on Halloween 2005. Its meaning remains unexplained
- In Rick Ross' song "Hustlin'", he rhymes "22" with itself 7 times.
- In Jay-Z's song "22 Two's", he rhymes the words: too, to and two, 22 times in the first verse.
[edit] In journalism, literature, film and television
- Catch-22, the 1961 novel (and its 1970 film version) by Joseph Heller, which consequently gave rise to the expression "catch 22"
- Twenty-Two, Season 2–episode 17 (February 10, 1961) of the 1959-64 TV series The Twilight Zone in which a hospitalized dancer has nightmares about a sinister nurse inviting her to Room 22, the hospital morgue.
- Revista 22, a magazine published in Romania
- The typical (minimum) number of episodes in a season for a television program broadcast on a major American network is 22.
[edit] In weights and measures
[edit] In computing
- The standard port number for the Secure Shell protocol
[edit] In photography
- f/22 is the largest f-stop (and thus smallest aperture) available on most lenses made for single-lens reflex cameras
[edit] In politics
- The central number in the numerologically-based political platform of fringe U.S. Presidential candidate Love 22
[edit] In jargon
- In French, "22" is used as a phrase to warn of the coming of the police (typically "22, v'là les flics !", "22, here come the cops!")
[edit] Historical years
22 A.D., 22 B.C., 1922, 2022, etc.
[edit] See also
http://www.webspawner.com/users/cosmic/ (22) Chaldean numerology....