yes it is a whole number
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21% is a fraction between 0 and 1. It cannot be converted to a whole number.
A whole number is a number that has no fractions or decimal places attached to it. 21 is a whole number. 3.75 is not.
21
21
4 and 3 * * * * * 19 is itself a whole number and no whole number can lie between two consecutive whole numbers.