3 is prime and 4 is not divisible by 3, so the only common factor they have is 1.
The factors of 3 are just 1 and 3.
The factors of 4 are 1, 2, and 4.
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The 4 factors of 129 are 1, 3, 43, and 129. The prime factors of 129 are 3 and 43.
3 does not have 16 factors. 3 does not have any factors; 3 is a prime number. Probably you meant to ask, "what are the 3 factors of 16?". If you don't count 1 then the 3 factors of 16 are 2, 4, and 8.
12 has 6 factors: 1, 2, 3, 4, 6, and 12
The factors of -12 are 1, 2, 3, 4, 6, 12 and their negatives. The prime factors are 2 and 3.