What is the Least Common Multiple of 21621 and 21638?

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 21621 and 21638 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21621 and 21638, than apply into the LCM equation.

GCF(21621,21638) = 1
LCM(21621,21638) = ( 21621 × 21638) / 1
LCM(21621,21638) = 467835198 / 1
LCM(21621,21638) = 467835198

Least Common Multiple (LCM) of 21621 and 21638 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21621 and 21638. First we will calculate the prime factors of 21621 and 21638.

Prime Factorization of 21621

Prime Factorization of 21638

Now multiplying the highest exponent prime factors to calculate the LCM of 21621 and 21638.

LCM(21621,21638) = 3¹ × 7207¹ × 2¹ × 31¹ × 349¹
LCM(21621,21638) = 467835198