215521315204 has 96 divisors (see below), whose sum is σ = 438387586560. Its totient is φ = 91852185600.

The previous prime is 215521315199. The next prime is 215521315249. The reversal of 215521315204 is 402513125512.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64122484 + ... + 64125844.

It is an arithmetic number, because the mean of its divisors is an integer number (4566537360).

Almost surely, 2^215521315204 is an apocalyptic number.

It is an amenable number.

215521315204 is an abundant number, since it is smaller than the sum of its proper divisors (222866271356).

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

215521315204 is a wasteful number, since it uses less digits than its factorization.

215521315204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5021 (or 5019 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 215521315204 in words is "two hundred fifteen billion, five hundred twenty-one million, three hundred fifteen thousand, two hundred four".