What is the Least Common Multiple of 31209 and 31221?

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 31209 and 31221 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 31209 and 31221, than apply into the LCM equation.

GCF(31209,31221) = 3
LCM(31209,31221) = ( 31209 × 31221) / 3
LCM(31209,31221) = 974376189 / 3
LCM(31209,31221) = 324792063

Least Common Multiple (LCM) of 31209 and 31221 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 31209 and 31221. First we will calculate the prime factors of 31209 and 31221.

Prime Factorization of 31209

Prime Factorization of 31221

Now multiplying the highest exponent prime factors to calculate the LCM of 31209 and 31221.

LCM(31209,31221) = 3² × 101¹ × 103¹ × 3469¹
LCM(31209,31221) = 324792063