215021353664 has 56 divisors (see below), whose sum is σ = 467037743088. Its totient is φ = 97613706240.

The previous prime is 215021353639. The next prime is 215021353697. The reversal of 215021353664 is 466353120512.

215021353664 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2067602 + ... + 2169105.

It is an arithmetic number, because the mean of its divisors is an integer number (8339959698).

Almost surely, 2^215021353664 is an apocalyptic number.

It is an amenable number.

215021353664 is an abundant number, since it is smaller than the sum of its proper divisors (252016389424).

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

215021353664 is a wasteful number, since it uses less digits than its factorization.

215021353664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236793 (or 4236783 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 215021353664 in words is "two hundred fifteen billion, twenty-one million, three hundred fifty-three thousand, six hundred sixty-four".