I suppose you could write it as 20 and 4/4, but that doesn't make a lot of sense. In general, whole numbers and mixed numbers are separate things.
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The mixed number is: 21 3/5
2.01 as a mixed number = 21/100
16.21 into mixed number = 16 21/100
21.5 as a mixed number = 21 1/2
21/5 written as a mixed number is 4 and 1/5