121399056 has 60 divisors (see below), whose sum is σ = 357638320. Its totient is φ = 38335680.

The previous prime is 121399021. The next prime is 121399067. The reversal of 121399056 is 650993121.

It is a super-2 number, since 2×121399056² = 29475461595382272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 121399056.

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 11 ways as a sum of consecutive naturals, for example, 19450 + ... + 24921.

Almost surely, 2^121399056 is an apocalyptic number.

121399056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121399056 is an abundant number, since it is smaller than the sum of its proper divisors (236239264).

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

121399056 is a wasteful number, since it uses less digits than its factorization.

121399056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44404 (or 44395 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 121399056 is about 11018.1239782460. The cubic root of 121399056 is about 495.1518848268.

The spelling of 121399056 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, fifty-six".