The GCF (Greatest Common Factor) of a single number, like 12, is typically interpreted as the number itself, since the greatest common factor of a number with itself is the number.
However, if you are looking for the GCF of 12 and another number, please provide that second number for an accurate calculation.
For completeness, the factors of 12 are 1, 2, 3, 4, 6, and 12. If you're interested in the prime factorization of 12, it is \(2^2 \times 3\).