The GCF is 107.
321 = 3*107.
107
1, 3, 107, 321
The four multiples of 107 are 107, 214, 321, and 428.
3 × 107
321 = 3 x 107
By any of its factors which are: 1, 3, 107 and 321
The factors of 321 are: 1, 3, 107, 321
321/107 = 3 ... it can't any simpler than that.
321 = 3 x 107
They are: 1, 3, 107 and 321