Since 21 is a factor of 147, it is automatically the GCF.
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The GCF is 21.
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.