21630024556 has 24 divisors (see below), whose sum is σ = 43263503136. Its totient is φ = 9269270400.

The previous prime is 21630024553. The next prime is 21630024571. The reversal of 21630024556 is 65542003612.

It is not an unprimeable number, because it can be changed into a prime (21630024553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467256 + ... + 511456.

It is an arithmetic number, because the mean of its divisors is an integer number (1802645964).

Almost surely, 2^21630024556 is an apocalyptic number.

It is an amenable number.

21630024556 is an abundant number, since it is smaller than the sum of its proper divisors (21633478580).

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

21630024556 is a wasteful number, since it uses less digits than its factorization.

21630024556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61689 (or 61687 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 21630024556 in words is "twenty-one billion, six hundred thirty million, twenty-four thousand, five hundred fifty-six".