Anything that isn't 1, 2, 3, 4, 6, 12
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12 is.
12 is.
12 is a multiple of 6 and 1 is a factor of 12 and so 12+1 = 13
The prime factors of 12 are 2 and 3. The only prime factor of 27 is 3. The prime number that both 12 and 27 have as a factor is 3.
No odd whole numbers have 12 as a factor. 1 and 3 are odd numbers that are factors of 12.