121156560 has 200 divisors, whose sum is σ = 481088256. Its totient is φ = 27682560.

The previous prime is 121156549. The next prime is 121156579. The reversal of 121156560 is 65651121.

It is a happy number.

121156560 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 5 + 656 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 44025 + ... + 46695.

Almost surely, 2^121156560 is an apocalyptic number.

121156560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121156560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240544128).

121156560 is an abundant number, since it is smaller than the sum of its proper divisors (359931696).

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

121156560 is a wasteful number, since it uses less digits than its factorization.

121156560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703 (or 2688 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 121156560 is about 11007.1140631866. The cubic root of 121156560 is about 494.8219745488.

The spelling of 121156560 in words is "one hundred twenty-one million, one hundred fifty-six thousand, five hundred sixty".