21107775264 has 24 divisors (see below), whose sum is σ = 55407910320. Its totient is φ = 7035925056.

The previous prime is 21107775233. The next prime is 21107775289. The reversal of 21107775264 is 46257770112.

It is a tau number, because it is divible by the number of its divisors (24).

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, 109936234 + ... + 109936425.

It is an arithmetic number, because the mean of its divisors is an integer number (2308662930).

Almost surely, 2^21107775264 is an apocalyptic number.

21107775264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21107775264 is an abundant number, since it is smaller than the sum of its proper divisors (34300135056).

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

21107775264 is a wasteful number, since it uses less digits than its factorization.

21107775264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219872672 (or 219872664 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The spelling of 21107775264 in words is "twenty-one billion, one hundred seven million, seven hundred seventy-five thousand, two hundred sixty-four".