What is the Least Common Multiple of 21543 and 21561?

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 21543 and 21561 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21543 and 21561, than apply into the LCM equation.

GCF(21543,21561) = 3
LCM(21543,21561) = ( 21543 × 21561) / 3
LCM(21543,21561) = 464488623 / 3
LCM(21543,21561) = 154829541

Least Common Multiple (LCM) of 21543 and 21561 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21543 and 21561. First we will calculate the prime factors of 21543 and 21561.

Prime Factorization of 21543

Prime Factorization of 21561

Now multiplying the highest exponent prime factors to calculate the LCM of 21543 and 21561.

LCM(21543,21561) = 3¹ × 43¹ × 167¹ × 7187¹
LCM(21543,21561) = 154829541