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That would be 1--no numbers besides 1 go into both 10 and 21.
21 is a composite number, as it can be divided by 7 and 3. The other three numbers are prime numbers and do not divide into anything besides themselves.
24
Whole numbers are known as zero plus the "counting numbers." (1, 2, 3, ...) So, the whole numbers of 21 would be 0 - 21. (23 numbers.)
1, 3, 7 and 21. Four numbers.