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What is the Least Common Multiple of 217 and 221?

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 (LCM) of 217 and 221 is 47957.

LCM(217,221) = 47957

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Least Common Multiple of 217 and 221 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 217 and 221, than apply into the LCM equation.

GCF(217,221) = 1
LCM(217,221) = ( 217 × 221) / 1
LCM(217,221) = 47957 / 1
LCM(217,221) = 47957

Least Common Multiple (LCM) of 217 and 221 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 217 and 221. First we will calculate the prime factors of 217 and 221.

Prime Factorization of 217

Prime factors of 217 are 7, 31. Prime factorization of 217 in exponential form is:

217 = 71 × 311

Prime Factorization of 221

Prime factors of 221 are 13, 17. Prime factorization of 221 in exponential form is:

221 = 131 × 171

Now multiplying the highest exponent prime factors to calculate the LCM of 217 and 221.

LCM(217,221) = 71 × 311 × 131 × 171
LCM(217,221) = 47957