There are infinitely many multiples of 21 and it is impossible to list them all other than as 21*n where n is an integer.
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Multiples of 21 are numbers that can be divided evenly by 21. The first few multiples of 21 are 21, 42, 63, 84, 105, and so on. To find more multiples of 21, you can continue adding 21 to the previous multiple.
no they are nor multiples of 6
The common multiples of 9 and 21 are 63, 126, 189 and so on.
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.