What is the Least Common Multiple of 21381 and 21399?

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 21381 and 21399 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21381 and 21399, than apply into the LCM equation.

GCF(21381,21399) = 3
LCM(21381,21399) = ( 21381 × 21399) / 3
LCM(21381,21399) = 457532019 / 3
LCM(21381,21399) = 152510673

Least Common Multiple (LCM) of 21381 and 21399 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21381 and 21399. First we will calculate the prime factors of 21381 and 21399.

Prime Factorization of 21381

Prime Factorization of 21399

Now multiplying the highest exponent prime factors to calculate the LCM of 21381 and 21399.

LCM(21381,21399) = 3¹ × 7127¹ × 7¹ × 1019¹
LCM(21381,21399) = 152510673