630
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LCM of 21 and 45=315 Factors of 21= 3x7 Factors of 45=3x3x5 Lcm= 3x5x7x3=315
14 = 2*7 45 = 5*9 LCM = 14*45 = 630
For 21, 63 and 167 the LCM is: 10,521
LCM(6, 21, 28) = 84.
The least common multiple of 6, 12 and 21 is 84.