21321201324 has 12 divisors (see below), whose sum is σ = 49749469784. Its totient is φ = 7107067104.

The previous prime is 21321201311. The next prime is 21321201353. The reversal of 21321201324 is 42310212312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21321201324.

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, 888383377 + ... + 888383400.

Almost surely, 2^21321201324 is an apocalyptic number.

It is an amenable number.

21321201324 is an abundant number, since it is smaller than the sum of its proper divisors (28428268460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21321201324 is a wasteful number, since it uses less digits than its factorization.

21321201324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776766784 (or 1776766782 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21321201324 its reverse (42310212312), we get a palindrome (63631413636).

The spelling of 21321201324 in words is "twenty-one billion, three hundred twenty-one million, two hundred one thousand, three hundred twenty-four".