21330031012 has 12 divisors (see below), whose sum is σ = 37853294976. Its totient is φ = 10514803880.

The previous prime is 21330030983. The next prime is 21330031039. The reversal of 21330031012 is 21013003312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37552588 + ... + 37553155.

It is an arithmetic number, because the mean of its divisors is an integer number (3154441248).

Almost surely, 2^21330031012 is an apocalyptic number.

It is an amenable number.

21330031012 is a deficient number, since it is larger than the sum of its proper divisors (16523263964).

21330031012 is a wasteful number, since it uses less digits than its factorization.

21330031012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75105818 (or 75105816 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21330031012 its reverse (21013003312), we get a palindrome (42343034324).

The spelling of 21330031012 in words is "twenty-one billion, three hundred thirty million, thirty-one thousand, twelve".