You need at least two numbers to find an LCM.
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The least common multiple of 21 , 19 = 399
The least common multiple of the numbers 21 and 113 is 2,373.
The least common multiple of the numbers 72 and 21 is 504.
The least common multiple of 12 , 21 , 45 = 1,260
The Least Common Multiple (LCM) of the numbers 21, 149 is 3,129.