21513431512 has 16 divisors (see below), whose sum is σ = 40341420000. Its totient is φ = 10755719520.

The previous prime is 21513431503. The next prime is 21513431519.

21513431512 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21513431512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513431519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28387 + ... + 209362.

It is an arithmetic number, because the mean of its divisors is an integer number (2521338750).

Almost surely, 2^21513431512 is an apocalyptic number.

It is an amenable number.

21513431512 is a deficient number, since it is larger than the sum of its proper divisors (18827988488).

21513431512 is a wasteful number, since it uses less digits than its factorization.

21513431512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249066 (or 249062 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The spelling of 21513431512 in words is "twenty-one billion, five hundred thirteen million, four hundred thirty-one thousand, five hundred twelve".