What is the Least Common Multiple of 21381 and 21400?

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 21400 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 21400, than apply into the LCM equation.

GCF(21381,21400) = 1
LCM(21381,21400) = ( 21381 × 21400) / 1
LCM(21381,21400) = 457553400 / 1
LCM(21381,21400) = 457553400

Least Common Multiple (LCM) of 21381 and 21400 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21381 and 21400. First we will calculate the prime factors of 21381 and 21400.

Prime Factorization of 21381

Prime Factorization of 21400

Now multiplying the highest exponent prime factors to calculate the LCM of 21381 and 21400.

LCM(21381,21400) = 3¹ × 7127¹ × 2³ × 5² × 107¹
LCM(21381,21400) = 457553400