What is the Least Common Multiple of 21407 and 21421?

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 21407 and 21421 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21407 and 21421, than apply into the LCM equation.

GCF(21407,21421) = 1
LCM(21407,21421) = ( 21407 × 21421) / 1
LCM(21407,21421) = 458559347 / 1
LCM(21407,21421) = 458559347

Least Common Multiple (LCM) of 21407 and 21421 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21407 and 21421. First we will calculate the prime factors of 21407 and 21421.

Prime Factorization of 21407

Prime Factorization of 21421

Now multiplying the highest exponent prime factors to calculate the LCM of 21407 and 21421.

LCM(21407,21421) = 21407¹ × 31¹ × 691¹
LCM(21407,21421) = 458559347