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Multiply 21 and 11 to get a common multiple. Since 21 and 11 have no common factors, that also happens to be the least common multiple.All other common multiples are multiples of this least common multiple.

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Any multiple of 231.

Q: What are the common multiples of 21 and 11?

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LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.

there are infinite amount of common multiples.

The common multiples of 9 and 21 are 63, 126, 189 and so on.

Two common multiples of 21 and 15 are 105 and 315.

The common multiples of 3 and 21 are 21, 42, 63 and so on.

The common multiples of 11 and 4 are 88, and 4.

The common multiples of 9 and 11 are 99, 198, 297 and so on.

They are: 407 and its multiples

The COMMON multiples of 11 require at least one other number with which the multiple is COMMON. The COMMON multiples will be multiples of 11. The multiples of 11 between 1 and 100 are {11, 22, 33, 44, 55, 66, 77, 88, 99}, thus the COMMON multiples of 11 [with other numbers] wil be one, or more of this set.

Any pair of numbers has an infinite set of common multiples. The lowest common multiple of 9 and 21 is 63 and the others are multiples of this, e.g. 63, 126, 189, 252, 315, ...

The least common multiples of 5, 11, and 13 is 715.

Odd multiples of 21.