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21 x 7 49 x 3 147 x 1
3 and 7
The numbers are: 1 plus square root of 21 and 1 minus square root of 21
7x3 or 3x7, which is all you can do to multiply to get 21.
The factor pairs of 189 are: 1 x 189 3 x 63 7 x 27 9 x 21