115712554221 has 36 divisors (see below), whose sum is σ = 183773604924. Its totient is φ = 70106931840.

The previous prime is 115712554213. The next prime is 115712554249. The reversal of 115712554221 is 122455217511.

115712554221 is a `hidden beast` number, since 1 + 1 + 5 + 71 + 25 + 542 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25195212900 + 90517341321 = 158730^2 + 300861^2 .

It is not a de Polignac number, because 115712554221 - 2³ = 115712554213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115712554211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3897991 + ... + 3927563.

It is an arithmetic number, because the mean of its divisors is an integer number (5104822359).

Almost surely, 2^115712554221 is an apocalyptic number.

115712554221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

115712554221 is a deficient number, since it is larger than the sum of its proper divisors (68061050703).

115712554221 is a wasteful number, since it uses less digits than its factorization.

115712554221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33194 (or 33180 counting only the distinct ones).

The product of its digits is 28000, while the sum is 36.

It can be divided in two parts, 1157125 and 54221, that added together give a triangular number (1211346 = T₁₅₅₆).

The spelling of 115712554221 in words is "one hundred fifteen billion, seven hundred twelve million, five hundred fifty-four thousand, two hundred twenty-one".