21306133164 has 48 divisors (see below), whose sum is σ = 49964947200. Its totient is φ = 7066310976.

The previous prime is 21306133157. The next prime is 21306133217. The reversal of 21306133164 is 46133160312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2704359 + ... + 2712225.

It is an arithmetic number, because the mean of its divisors is an integer number (1040936400).

Almost surely, 2^21306133164 is an apocalyptic number.

It is an amenable number.

21306133164 is an abundant number, since it is smaller than the sum of its proper divisors (28658814036).

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

21306133164 is a wasteful number, since it uses less digits than its factorization.

21306133164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8982 (or 8980 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

Adding to 21306133164 its reverse (46133160312), we get a palindrome (67439293476).

The spelling of 21306133164 in words is "twenty-one billion, three hundred six million, one hundred thirty-three thousand, one hundred sixty-four".