The greatest common factor of 21 and 77 is 7.
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 175 is 7.
The greatest common factor of 21 and 75 is 3.
The Greatest Common Factor of 21, 9 is 3.
The greatest common factor of 21 and 322 is 7.
The greatest common factor of 21 and 162 is 3.
The greatest common factor of 21 and 102 is 3.
The greatest common factor of 21 and 56 is 7.
The Greatest Common Factor of 14 and 21 is 7.
The Greatest Common Factor of 21, 63, 84: 21
The Greatest Common Factor of 60, 21, 9: 3