21513063630 has 64 divisors (see below), whose sum is σ = 52211962368. Its totient is φ = 5672457600.

The previous prime is 21513063613. The next prime is 21513063641. The reversal of 21513063630 is 3636031512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2489377 + ... + 2498003.

It is an arithmetic number, because the mean of its divisors is an integer number (815811912).

Almost surely, 2^21513063630 is an apocalyptic number.

21513063630 is an abundant number, since it is smaller than the sum of its proper divisors (30698898738).

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

21513063630 is a wasteful number, since it uses less digits than its factorization.

21513063630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9561.

The product of its (nonzero) digits is 9720, while the sum is 30.

The spelling of 21513063630 in words is "twenty-one billion, five hundred thirteen million, sixty-three thousand, six hundred thirty".