121938820 has 24 divisors (see below), whose sum is σ = 256281984. Its totient is φ = 48735456.

The previous prime is 121938787. The next prime is 121938871. The reversal of 121938820 is 28839121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40197 + ... + 43123.

It is an arithmetic number, because the mean of its divisors is an integer number (10678416).

Almost surely, 2^121938820 is an apocalyptic number.

121938820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121938820 is an abundant number, since it is smaller than the sum of its proper divisors (134343164).

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

121938820 is a wasteful number, since it uses less digits than its factorization.

121938820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019 (or 5017 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 121938820 is about 11042.5911814211. The cubic root of 121938820 is about 495.8846473425.

The spelling of 121938820 in words is "one hundred twenty-one million, nine hundred thirty-eight thousand, eight hundred twenty".