21513088512 has 160 divisors (see below), whose sum is σ = 65162972160. Its totient is φ = 7004067840.

The previous prime is 21513088501. The next prime is 21513088529. The reversal of 21513088512 is 21588031512.

21513088512 is a `hidden beast` number, since 2 + 1 + 5 + 130 + 8 + 8 + 512 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 576337 + ... + 612527.

It is an arithmetic number, because the mean of its divisors is an integer number (407268576).

Almost surely, 2^21513088512 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 21513088512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32581486080).

21513088512 is an abundant number, since it is smaller than the sum of its proper divisors (43649883648).

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

21513088512 is an equidigital number, since it uses as much as digits as its factorization.

21513088512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36261 (or 36239 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 21513088512 in words is "twenty-one billion, five hundred thirteen million, eighty-eight thousand, five hundred twelve".