21131000312 has 32 divisors (see below), whose sum is σ = 41590886400. Its totient is φ = 10045600224.

The previous prime is 21131000311. The next prime is 21131000377. The reversal of 21131000312 is 21300013112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131000311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313112 + ... + 374567.

It is an arithmetic number, because the mean of its divisors is an integer number (1299715200).

Almost surely, 2^21131000312 is an apocalyptic number.

It is an amenable number.

21131000312 is a deficient number, since it is larger than the sum of its proper divisors (20459886088).

21131000312 is a wasteful number, since it uses less digits than its factorization.

21131000312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687875 (or 687871 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21131000312 its reverse (21300013112), we get a palindrome (42431013424).

The spelling of 21131000312 in words is "twenty-one billion, one hundred thirty-one million, three hundred twelve", and thus it is an aban number.