The Greatest Common Factor of 14 and 21 is 7.
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As 4 & 21 have no factors in common, gcf=1
21=3x714=2x77 is the greatest common factor
21 itself is the greatest common integral factor, since 21 X 2 = 42.
The greatest common factor of 18 and 21 is 3.
The Greatest Common Factor (GCF) is: 7