Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
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1, 17, 41, 697
1, 2, 17, 34
1, 13, 17 and 221.
These are all the whole numbers that go into 527 evenly: 1, 17, 31, 527.
1 and 17 will go into both numbers evenly leaving no remainderd