What is the Least Common Multiple of 21857 and 21861?

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 21857 and 21861 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21857 and 21861, than apply into the LCM equation.

GCF(21857,21861) = 1
LCM(21857,21861) = ( 21857 × 21861) / 1
LCM(21857,21861) = 477815877 / 1
LCM(21857,21861) = 477815877

Least Common Multiple (LCM) of 21857 and 21861 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21857 and 21861. First we will calculate the prime factors of 21857 and 21861.

Prime Factorization of 21857

Prime Factorization of 21861

Now multiplying the highest exponent prime factors to calculate the LCM of 21857 and 21861.

LCM(21857,21861) = 11¹ × 1987¹ × 3² × 7¹ × 347¹
LCM(21857,21861) = 477815877