The factors of 21 are 1, 3, 7, and 21
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The factors of 21 are: 1, 3, 7, 21.
The factors of 21: 1, 3, 7, 21.
The factors of 7 are 1 and 7. The factors of 21 are 1, 3, 7, and 21. The only numbers that are factors of BOTH 7 and 21 are 1 and 7.
The common factors of 21 42 and 84 are 21
4 factors they are 1,3,7 and 21