115220521 has 32 divisors (see below), whose sum is σ = 134435840. Its totient is φ = 97977600.

The previous prime is 115220513. The next prime is 115220527. The reversal of 115220521 is 125022511.

It is a cyclic number.

It is not a de Polignac number, because 115220521 - 2³ = 115220513 is a prime.

It is a super-2 number, since 2×115220521² = 26551536919022882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (115220527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1057015 + ... + 1057123.

It is an arithmetic number, because the mean of its divisors is an integer number (4201120).

Almost surely, 2^115220521 is an apocalyptic number.

It is an amenable number.

115220521 is a deficient number, since it is larger than the sum of its proper divisors (19215319).

115220521 is a wasteful number, since it uses less digits than its factorization.

115220521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 115220521 is about 10734.0822150755. The cubic root of 115220521 is about 486.6050497979.

The spelling of 115220521 in words is "one hundred fifteen million, two hundred twenty thousand, five hundred twenty-one".