What is the Least Common Multiple of 21210 and 21218?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 21210 and 21218 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21210 and 21218, than apply into the LCM equation.

GCF(21210,21218) = 2
LCM(21210,21218) = ( 21210 × 21218) / 2
LCM(21210,21218) = 450033780 / 2
LCM(21210,21218) = 225016890

Least Common Multiple (LCM) of 21210 and 21218 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21210 and 21218. First we will calculate the prime factors of 21210 and 21218.

Prime Factorization of 21210

Prime Factorization of 21218

Now multiplying the highest exponent prime factors to calculate the LCM of 21210 and 21218.

LCM(21210,21218) = 2¹ × 3¹ × 5¹ × 7¹ × 101¹ × 103²
LCM(21210,21218) = 225016890