The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.
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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 (LCM) of the numbers 21, 149 is 3,129.
The least common multiple of 12 , 21 , 45 = 1,260
The Least Common Multiple of 21, 63, 147: 441