What is the greatest common factor shared by 51 and 21?
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The greatest common factor of 21 and 77 is 7.
The Greatest Common Factor of 21, 9 is 3.
The Greatest Common Factor of 21, 63, 84: 21
The Greatest Common Factor (GCF) of 21 and 98 is 7.
7 is the greatest common factor of 4942 and 21, or of 49, 42 and 21, if that is what you meant.