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As a biprime with proper divisors 1, 3 and 7, twenty-one has a prime aliquot sum of 11 within an aliquot sequence containing only one composite number (21, 11, 1, 0); it is the second composite number with an aliquot sum of 11, following 18. 21 is the first member of the second cluster of consecutive discrete semiprimes (21, 22), where the next such cluster is (33, 34, 35).
Also used for other numbers ending in '2' (see '72' below). Chicken vindaloo [1] Introduced by Butlins in 2003. [1] Deck of cards Number of cards in a deck. Weeks in a year Number of weeks in a Gregorian year. 53 Here comes Herbie! 53 is the racing number of Herbie the VW Beetle. Players may reply "beep beep!". Stuck in the tree Rhymes with ...
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A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
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