It could be 11.
+4, -3, +5, -2, +6, -1, +7
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1, 2, 3, 4, 6, 12 1, 2, 3, 4, 6, 12
Anything divided by one is the original number.
12 = 2 x 2 x 3
2 x 2 x 3 is the prime factorization for 12.
3 is prime number otherwise 12 has 1 12 2 3 4 6 24 has 1 24 2 12 3 8 4 6