What is the Least Common Multiple of 21315 and 21329?

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 21315 and 21329 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21315 and 21329, than apply into the LCM equation.

GCF(21315,21329) = 7
LCM(21315,21329) = ( 21315 × 21329) / 7
LCM(21315,21329) = 454627635 / 7
LCM(21315,21329) = 64946805

Least Common Multiple (LCM) of 21315 and 21329 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21315 and 21329. First we will calculate the prime factors of 21315 and 21329.

Prime Factorization of 21315

Prime Factorization of 21329

Now multiplying the highest exponent prime factors to calculate the LCM of 21315 and 21329.

LCM(21315,21329) = 3¹ × 5¹ × 7² × 29¹ × 11¹ × 277¹
LCM(21315,21329) = 64946805