63
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Until that other number shows up, the LCM is 63.
The LCM is 252.
The LCM is 63.
It is: 252
The LCM of 9 and 21 is 63, which is the multiple of the highest power of prime factors from both numbers, is 63. (3² x 7 = 3 x 3 x 7 = 63).