121672220 has 12 divisors (see below), whose sum is σ = 255511704. Its totient is φ = 48668880.

The previous prime is 121672217. The next prime is 121672279. The reversal of 121672220 is 22276121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3041786 + ... + 3041825.

It is an arithmetic number, because the mean of its divisors is an integer number (21292642).

Almost surely, 2^121672220 is an apocalyptic number.

121672220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121672220 is an abundant number, since it is smaller than the sum of its proper divisors (133839484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121672220 is a wasteful number, since it uses less digits than its factorization.

121672220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083620 (or 6083618 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 121672220 is about 11030.5131340296. The cubic root of 121672220 is about 495.5229924540.

The spelling of 121672220 in words is "one hundred twenty-one million, six hundred seventy-two thousand, two hundred twenty".