0
Anonymous
21/7 = 3
21/3 = 7
36/2 = 18
36/4 = 9
36/6 = 6
36/12 = 3
36/18 = 2
and, of course, both 21 and 36 can be divided by 1 and themselves
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Any of its factos
(1), 4.
It is one = 1
4 goes into 36 evenly, but 13 does not.
3