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There are none. The lowest multiple of 21 is 21.
there are 21 multiples.
21,42,63,84
21, 42, 63, 84.
21: 21, 42, 63, and 84!
21, 42, 63, 84
63
Just 63.
They are: 21, 42, 63 and 84
itzz 63