21363528256 has 112 divisors (see below), whose sum is σ = 51699525760. Its totient is φ = 8554844160.

The previous prime is 21363528163. The next prime is 21363528269. The reversal of 21363528256 is 65282536312.

It is a tau number, because it is divible by the number of its divisors (112).

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, 604186 + ... + 638566.

Almost surely, 2^21363528256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21363528256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25849762880).

21363528256 is an abundant number, since it is smaller than the sum of its proper divisors (30335997504).

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

21363528256 is a wasteful number, since it uses less digits than its factorization.

21363528256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34492 (or 34482 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The spelling of 21363528256 in words is "twenty-one billion, three hundred sixty-three million, five hundred twenty-eight thousand, two hundred fifty-six".