22 (number)

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This article is about the number. For other uses, see 22 (disambiguation).
← 21 22 23 →
Cardinal twenty-two
Ordinal 22nd
(twenty-second)
Factorization 2 × 11
Divisors 1, 2, 11, 22
Roman numeral XXII
Binary 101102
Ternary 2113
Quaternary 1124
Quinary 425
Senary 346
Octal 268
Duodecimal 1A12
Hexadecimal 1616
Vigesimal 1220
Base 36 M36

22 (twenty-two) is the natural number following 21 and preceding 23. In a 24-hour clock, the twentysecond hour is in conventional language called ten or ten o'clock.

In mathematics[edit]

22 is deficient

When cutting a circle with just six line segments, the maximum number of pieces that can be so created is 22,[3] thus 22 is a central polygonal number (see lazy caterer's sequence).[4]

In physics and chemistry[edit]

In aircraft[edit]

  • 22 is the designation of the USAF stealth fighter, the F-22 Raptor.

In art, entertainment, and media[edit]

In music[edit]

In other fields[edit]

  • In bingo, 22 is referred to as "Two Little Ducks"
  • Catch-22 (1961), Joseph Heller's novel, and its 1970 film version) by Joseph Heller, adaptation gave rise to the expression of logic "catch-22"
  • Revista 22 is a magazine published in Romania
  • There are 22 stars in the Paramount Pictures logo.
  • "Twenty Two" (February 10, 1961) is 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.
  • Traditional Tarot decks have 22 cards with allegorical subjects. These serve as trump cards in the game. The Fool is usually a kind of wild-card among the trumps and unnumbered, so the highest trump is numbered 21. Occult Tarot decks usually have 22 similar cards which are called Major Arcana by fortune-tellers. Occultists have related this number to the 22 letters of the Hebrew alphabet and the 22 paths in the Kabbalistic Tree of Life.

In computing and technology[edit]

In religion[edit]

In sports[edit]

In American football[edit]

  • 22 is the number of players on the field at any one time in an American football match

In Australian rules football[edit]

  • Each team is allowed a squad of 22 players (18 on the field and 4 interchanges).
  • In the top-level Australian Football League, each team plays 22 matches in the regular (or "home-and-away") season.

In cricket[edit]

In jerseys[edit]

In motorsports[edit]

In rugby union[edit]

  • The "22" is a line in each half of the field which is 22 meters from the respective try line. It has significance in a number of laws particularly relating to kicking the ball away.

In soccer[edit]

In weights and measures[edit]

In other uses[edit]

Twenty-two may also refer to:

See also[edit]

References[edit]

  1. ^ "Sloane's A000326 : Pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31. 
  2. ^ "Sloane's A069099 : Centered heptagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31. 
  3. ^ Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1986): 31
  4. ^ "Sloane's A000124 : Central polygonal numbers (the Lazy Caterer's sequence)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31. 
  5. ^ "Sloane's A002088 : Sum of totient function". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31. 
  6. ^ "Sloane's A001608 : Perrin sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31. 
  7. ^ "Sloane's A059756 : Erdős-Woods numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31. 
  8. ^ "Sloane's A006753 : Smith numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31. 

External links[edit]