121163855 has 16 divisors (see below), whose sum is σ = 154466400. Its totient is φ = 90979200.

The previous prime is 121163851. The next prime is 121163869. The reversal of 121163855 is 558361121.

It is not a de Polignac number, because 121163855 - 2² = 121163851 is a prime.

It is a super-2 number, since 2×121163855² = 29361359516922050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121163851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4505 + ... + 16205.

It is an arithmetic number, because the mean of its divisors is an integer number (9654150).

Almost surely, 2^121163855 is an apocalyptic number.

121163855 is a deficient number, since it is larger than the sum of its proper divisors (33302545).

121163855 is a wasteful number, since it uses less digits than its factorization.

121163855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11834.

The product of its digits is 7200, while the sum is 32.

The square root of 121163855 is about 11007.4454347955. The cubic root of 121163855 is about 494.8319056491.

The spelling of 121163855 in words is "one hundred twenty-one million, one hundred sixty-three thousand, eight hundred fifty-five".