There are two factor pairs of 21:
21 = 1 x 21
21 = 3 x 7
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1 and 24 2 and 12 3 and 8 4 and 6
The factor pairs of 28 are :28,114,27,4
its a factor with two pairs of the same number
12 has 3 factor pairs and the pairs are (1,12), (2,6) and (3,4).
There is only one factor pair of 911: 911 = 1 x 911