21012931012 has 24 divisors (see below), whose sum is σ = 38608436160. Its totient is φ = 9992764320.

The previous prime is 21012931001. The next prime is 21012931057. The reversal of 21012931012 is 21013921012.

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, 1344064 + ... + 1359607.

It is an arithmetic number, because the mean of its divisors is an integer number (1608684840).

Almost surely, 2^21012931012 is an apocalyptic number.

It is an amenable number.

21012931012 is a deficient number, since it is larger than the sum of its proper divisors (17595505148).

21012931012 is a wasteful number, since it uses less digits than its factorization.

21012931012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703771 (or 2703769 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

Multiplying 21012931012 by its sum of digits (22), we get a palindrome (462284482264).

The spelling of 21012931012 in words is "twenty-one billion, twelve million, nine hundred thirty-one thousand, twelve".