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21 is the largest factor of 21
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.
The greatest common factor of 21 and 63 is 21.Since 21 is a factor of 63, it is automatically the GCF.
The greatest common factor of 21 and 75 is 3.
The greatest common factor of 21 and 322 is 7.