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222 (two hundred () twenty-two) is the natural number following 221 and preceding 223. It is a decimal repdigit and a strobogrammatic number (meaning that it looks the same turned upside down on a calculator display). It is one of the numbers whose digit sum in decimal is the same as it is in binary. 222 is a noncototient, meaning that it cannot be written in the form ''n'' − φ(''n'') where φ is Euler's totient function counting the number of values that are smaller than ''n'' and relatively prime to it. There are exactly 222 distinct ways of assigning a meet and join operation to a set of ten unlabeled elements in order to give them the structure of a lattice, and exactly 222 different six-edge polysticks. ==See also== *The years CE 222 or 222 BCE. *''Room 222'' (TV show) *Bell 222 (helicopter) *SdKfz 222, a WWII German reconnaissance vehicle *The 222s, a Montreal punk band which took its name from a code name for co-codaprin *''222'', a comedy album by Patton Oswalt *"222", a song by Paul McCartney on the 2-CD edition of his 2007 studio album ''Memory Almost Full''. *A-222 Bereg, a Russian self-propelled 130 mm coastal defence gun 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「222 (number)」の詳細全文を読む スポンサード リンク
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