For 12, 2 and 3
For 21, 3 and 7
For 32, 2
For 40, 2 and 5
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21 and 32
The only prime factor of 32 is 2.
The factors of 32 are: 1, 2, 4, 8, 16, and 32.The only prime factor of 32 is: 2.The factors of 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, and 48.The prime factors of 48 are: 2 and 3.The factors of 64 are: 1, 2, 4, 8, 16, 32, and 64.The only prime factor of 64 is: 2.
2 is the only prime factor of 32
It is 11 because it only has two factors which are itself and one