0
Anonymous
These numbers do: 1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260.
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No even number gose in 21. In fact there is none that goes in 21, either.
One.
Any of its factors
1
1 and 167 (167 is a prime number).