21326263164 has 72 divisors (see below), whose sum is σ = 54401238528. Its totient is φ = 7043863680.

The previous prime is 21326263129. The next prime is 21326263183. The reversal of 21326263164 is 46136262312.

21326263164 is a `hidden beast` number, since 2 + 13 + 2 + 6 + 2 + 631 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4299774 + ... + 4304730.

Almost surely, 2^21326263164 is an apocalyptic number.

It is an amenable number.

21326263164 is an abundant number, since it is smaller than the sum of its proper divisors (33074975364).

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

21326263164 is a wasteful number, since it uses less digits than its factorization.

21326263164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6035 (or 6030 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The spelling of 21326263164 in words is "twenty-one billion, three hundred twenty-six million, two hundred sixty-three thousand, one hundred sixty-four".