Aside from itself (21), the highest integer factor of 21 is 7.
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The GCF is 7.
The factors of 21 and 1,3,7, and 21Now since 21 is not a factor of 49, but 7 is we can say right away the GCF is 7.
21 and 80's highest common factor is one.
21 and 35's highest common factor is seven.
It is 7