215215215120 has 60 divisors (see below), whose sum is σ = 722764433196. Its totient is φ = 57390723840.

The previous prime is 215215215119. The next prime is 215215215139. The reversal of 215215215120 is 21512512512.

215215215120 is a `hidden beast` number, since 2 + 1 + 521 + 5 + 2 + 15 + 120 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 50781721104 + 164433494016 = 225348^2 + 405504^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×215215215120² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149454291 + ... + 149455730.

Almost surely, 2^215215215120 is an apocalyptic number.

215215215120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215215215120 is an abundant number, since it is smaller than the sum of its proper divisors (507549218076).

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

215215215120 is a wasteful number, since it uses less digits than its factorization.

215215215120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298910040 (or 298910031 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 215215215120 its reverse (21512512512), we get a palindrome (236727727632).

It can be divided in two parts, 21521521 and 5120, that added together give a triangular number (21526641 = T₆₅₆₁).

The spelling of 215215215120 in words is "two hundred fifteen billion, two hundred fifteen million, two hundred fifteen thousand, one hundred twenty".