121921320 has 32 divisors (see below), whose sum is σ = 365764320. Its totient is φ = 32512320.

The previous prime is 121921313. The next prime is 121921343. The reversal of 121921320 is 23129121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507886 + ... + 508125.

It is an arithmetic number, because the mean of its divisors is an integer number (11430135).

Almost surely, 2^121921320 is an apocalyptic number.

121921320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121921320 is an abundant number, since it is smaller than the sum of its proper divisors (243843000).

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

121921320 is a wasteful number, since it uses less digits than its factorization.

121921320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016025 (or 1016021 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 121921320 is about 11041.7987665054. The cubic root of 121921320 is about 495.8609239800.

The spelling of 121921320 in words is "one hundred twenty-one million, nine hundred twenty-one thousand, three hundred twenty".