If you mean what numbers add to 10, whose product is 21, that would be 3 and 7.
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11
21 and 32
The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
The factors of 21 are 1, 3, 7, and 21. 3 - 1 = 2
21 has two prime factors.