21513511230 has 16 divisors (see below), whose sum is σ = 51632427024. Its totient is φ = 5736936320.

The previous prime is 21513511199. The next prime is 21513511231. The reversal of 21513511230 is 3211531512.

It is a super-2 number, since 2×21513511230² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21513511230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513511231) 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, 358558491 + ... + 358558550.

It is an arithmetic number, because the mean of its divisors is an integer number (3227026689).

Almost surely, 2^21513511230 is an apocalyptic number.

21513511230 is an abundant number, since it is smaller than the sum of its proper divisors (30118915794).

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

21513511230 is a wasteful number, since it uses less digits than its factorization.

21513511230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717117051.

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 21513511230 in words is "twenty-one billion, five hundred thirteen million, five hundred eleven thousand, two hundred thirty".