What is the Least Common Multiple of 21661 and 21681?

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 21661 and 21681 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21661 and 21681, than apply into the LCM equation.

GCF(21661,21681) = 1
LCM(21661,21681) = ( 21661 × 21681) / 1
LCM(21661,21681) = 469632141 / 1
LCM(21661,21681) = 469632141

Least Common Multiple (LCM) of 21661 and 21681 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21661 and 21681. First we will calculate the prime factors of 21661 and 21681.

Prime Factorization of 21661

Prime Factorization of 21681

Now multiplying the highest exponent prime factors to calculate the LCM of 21661 and 21681.

LCM(21661,21681) = 21661¹ × 3³ × 11¹ × 73¹
LCM(21661,21681) = 469632141