- published: 04 Jul 2016
- views: 28920
21 (twenty-one) is the natural number following 20 and preceding 22.
21 is:
21 has an aliquot sum of 11 though it is the second composite number found in the 11-aliquot tree with the abundant square prime 18 being the first such member. Twenty-one is the first number to be the aliquot sum of three numbers 18, 51, 91.
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Run with me baby, let your hair down
through every station, through every town
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from peepshow to disco, from Spain to Camber Sands
Europe is our playground, London is our town