21532433256 has 64 divisors (see below), whose sum is σ = 60428995200. Its totient is φ = 7103476224.

The previous prime is 21532433243. The next prime is 21532433261. The reversal of 21532433256 is 65233423512.

21532433256 is a `hidden beast` number, since 2 + 1 + 5 + 324 + 3 + 325 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21532433256.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492900 + ... + 534803.

It is an arithmetic number, because the mean of its divisors is an integer number (944203050).

Almost surely, 2^21532433256 is an apocalyptic number.

It is an amenable number.

21532433256 is an abundant number, since it is smaller than the sum of its proper divisors (38896561944).

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

21532433256 is a wasteful number, since it uses less digits than its factorization.

21532433256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027815 (or 1027805 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

Adding to 21532433256 its reverse (65233423512), we get a palindrome (86765856768).

The spelling of 21532433256 in words is "twenty-one billion, five hundred thirty-two million, four hundred thirty-three thousand, two hundred fifty-six".