What is the Least Common Multiple of 21390 and 21397?

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 21390 and 21397 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21390 and 21397, than apply into the LCM equation.

GCF(21390,21397) = 1
LCM(21390,21397) = ( 21390 × 21397) / 1
LCM(21390,21397) = 457681830 / 1
LCM(21390,21397) = 457681830

Least Common Multiple (LCM) of 21390 and 21397 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21390 and 21397. First we will calculate the prime factors of 21390 and 21397.

Prime Factorization of 21390

Prime Factorization of 21397

Now multiplying the highest exponent prime factors to calculate the LCM of 21390 and 21397.

LCM(21390,21397) = 2¹ × 3¹ × 5¹ × 23¹ × 31¹ × 21397¹
LCM(21390,21397) = 457681830