Multiples? There are an infinite amount. Factors on the other hand, there are: 1, 3, 7 and 21.
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LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
There are infinitely many common multiples of 21 and 23. One such is 10626.
Two common multiples of 21 and 15 are 105 and 315.
The four multiples of seven are 7, 14, 21, and 28.