215231830920 has 96 divisors (see below), whose sum is σ = 699593656320. Its totient is φ = 57387753600.

The previous prime is 215231830909. The next prime is 215231830943. The reversal of 215231830920 is 29038132512.

215231830920 is a `hidden beast` number, since 2 + 1 + 523 + 18 + 30 + 92 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3114745 + ... + 3183095.

It is an arithmetic number, because the mean of its divisors is an integer number (7287433920).

Almost surely, 2^215231830920 is an apocalyptic number.

215231830920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215231830920 is an abundant number, since it is smaller than the sum of its proper divisors (484361825400).

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

215231830920 is a wasteful number, since it uses less digits than its factorization.

215231830920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77115 (or 77108 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 215231830920 in words is "two hundred fifteen billion, two hundred thirty-one million, eight hundred thirty thousand, nine hundred twenty".