21164163304 has 16 divisors (see below), whose sum is σ = 39684670020. Its totient is φ = 10581584640.

The previous prime is 21164163263. The next prime is 21164163329. The reversal of 21164163304 is 40336146112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20549222500 + 614940804 = 143350^2 + 24798^2 .

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, 169762 + ... + 266734.

Almost surely, 2^21164163304 is an apocalyptic number.

It is an amenable number.

21164163304 is a deficient number, since it is larger than the sum of its proper divisors (18520506716).

21164163304 is a wasteful number, since it uses less digits than its factorization.

21164163304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124260 (or 124256 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 21164163304 in words is "twenty-one billion, one hundred sixty-four million, one hundred sixty-three thousand, three hundred four".