115021521 has 6 divisors (see below), whose sum is σ = 166142210. Its totient is φ = 76681008.

The previous prime is 115021499. The next prime is 115021561. The reversal of 115021521 is 125120511.

115021521 is a `hidden beast` number, since 11 + 502 + 152 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 78588225 + 36433296 = 8865^2 + 6036^2 .

It is not a de Polignac number, because 115021521 - 2⁹ = 115021009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 115021494 and 115021503.

It is not an unprimeable number, because it can be changed into a prime (115021561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6390076 + ... + 6390093.

Almost surely, 2^115021521 is an apocalyptic number.

It is an amenable number.

115021521 is a deficient number, since it is larger than the sum of its proper divisors (51120689).

115021521 is a wasteful number, since it uses less digits than its factorization.

115021521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12780175 (or 12780172 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 115021521 is about 10724.8086696220. The cubic root of 115021521 is about 486.3247461219.

The spelling of 115021521 in words is "one hundred fifteen million, twenty-one thousand, five hundred twenty-one".