What is the Least Common Multiple of 21391 and 21409?

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 21391 and 21409 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21391 and 21409, than apply into the LCM equation.

GCF(21391,21409) = 1
LCM(21391,21409) = ( 21391 × 21409) / 1
LCM(21391,21409) = 457959919 / 1
LCM(21391,21409) = 457959919

Least Common Multiple (LCM) of 21391 and 21409 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21391 and 21409. First we will calculate the prime factors of 21391 and 21409.

Prime Factorization of 21391

Prime Factorization of 21409

Now multiplying the highest exponent prime factors to calculate the LCM of 21391 and 21409.

LCM(21391,21409) = 21391¹ × 79¹ × 271¹
LCM(21391,21409) = 457959919