What is the Least Common Multiple of 21423 and 21428?

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 21423 and 21428 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21423 and 21428, than apply into the LCM equation.

GCF(21423,21428) = 1
LCM(21423,21428) = ( 21423 × 21428) / 1
LCM(21423,21428) = 459052044 / 1
LCM(21423,21428) = 459052044

Least Common Multiple (LCM) of 21423 and 21428 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21423 and 21428. First we will calculate the prime factors of 21423 and 21428.

Prime Factorization of 21423

Prime Factorization of 21428

Now multiplying the highest exponent prime factors to calculate the LCM of 21423 and 21428.

LCM(21423,21428) = 3¹ × 37¹ × 193¹ × 2² × 11¹ × 487¹
LCM(21423,21428) = 459052044