21237460256 has 48 divisors (see below), whose sum is σ = 44331162624. Its totient is φ = 9980457984.

The previous prime is 21237460247. The next prime is 21237460267. The reversal of 21237460256 is 65206473212.

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, 377921 + ... + 430463.

It is an arithmetic number, because the mean of its divisors is an integer number (923565888).

Almost surely, 2^21237460256 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 21237460256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22165581312).

21237460256 is an abundant number, since it is smaller than the sum of its proper divisors (23093702368).

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

21237460256 is a wasteful number, since it uses less digits than its factorization.

21237460256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53313 (or 53305 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 21237460256 in words is "twenty-one billion, two hundred thirty-seven million, four hundred sixty thousand, two hundred fifty-six".