21312513412 has 24 divisors (see below), whose sum is σ = 38457599040. Its totient is φ = 10326924000.

The previous prime is 21312513379. The next prime is 21312513479. The reversal of 21312513412 is 21431521312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249712 + ... + 324007.

It is an arithmetic number, because the mean of its divisors is an integer number (1602399960).

Almost surely, 2^21312513412 is an apocalyptic number.

It is an amenable number.

21312513412 is a deficient number, since it is larger than the sum of its proper divisors (17145085628).

21312513412 is a wasteful number, since it uses less digits than its factorization.

21312513412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574011 (or 574009 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The spelling of 21312513412 in words is "twenty-one billion, three hundred twelve million, five hundred thirteen thousand, four hundred twelve".