21320032012 has 12 divisors (see below), whose sum is σ = 39273743320. Its totient is φ = 10098962496.

The previous prime is 21320032007. The next prime is 21320032037. The reversal of 21320032012 is 21023002312.

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, 140263293 + ... + 140263444.

Almost surely, 2^21320032012 is an apocalyptic number.

It is an amenable number.

21320032012 is a deficient number, since it is larger than the sum of its proper divisors (17953711308).

21320032012 is a wasteful number, since it uses less digits than its factorization.

21320032012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280526760 (or 280526758 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21320032012 its reverse (21023002312), we get a palindrome (42343034324).

The spelling of 21320032012 in words is "twenty-one billion, three hundred twenty million, thirty-two thousand, twelve".