21264077232 has 100 divisors (see below), whose sum is σ = 62975839080. Its totient is φ = 6923169792.

The previous prime is 21264077201. The next prime is 21264077239. The reversal of 21264077232 is 23277046212.

It is a happy number.

21264077232 is a `hidden beast` number, since 2 + 1 + 2 + 640 + 7 + 7 + 2 + 3 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21264077239) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 135057 + ... + 246512.

Almost surely, 2^21264077232 is an apocalyptic number.

It is an amenable number.

21264077232 is an abundant number, since it is smaller than the sum of its proper divisors (41711761848).

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

21264077232 is a wasteful number, since it uses less digits than its factorization.

21264077232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381632 (or 381617 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The spelling of 21264077232 in words is "twenty-one billion, two hundred sixty-four million, seventy-seven thousand, two hundred thirty-two".