21513031512 has 64 divisors (see below), whose sum is σ = 62074425600. Its totient is φ = 6085718400.

The previous prime is 21513031487. The next prime is 21513031559.

21513031512 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21513031512² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 616962 + ... + 650897.

It is an arithmetic number, because the mean of its divisors is an integer number (969912900).

Almost surely, 2^21513031512 is an apocalyptic number.

It is an amenable number.

21513031512 is an abundant number, since it is smaller than the sum of its proper divisors (40561394088).

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

21513031512 is a wasteful number, since it uses less digits than its factorization.

21513031512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267976 (or 1267972 counting only the distinct ones).

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

It can be divided in two parts, 215130 and 31512, that added together give a palindrome (246642).

The spelling of 21513031512 in words is "twenty-one billion, five hundred thirteen million, thirty-one thousand, five hundred twelve".