21764923732 has 12 divisors (see below), whose sum is σ = 38233442016. Its totient is φ = 10841083160.

The previous prime is 21764923723. The next prime is 21764923837. The reversal of 21764923732 is 23732946712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10343494 + ... + 10345597.

It is an arithmetic number, because the mean of its divisors is an integer number (3186120168).

Almost surely, 2^21764923732 is an apocalyptic number.

It is an amenable number.

21764923732 is a deficient number, since it is larger than the sum of its proper divisors (16468518284).

21764923732 is a wasteful number, since it uses less digits than its factorization.

21764923732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20689358 (or 20689356 counting only the distinct ones).

The product of its digits is 762048, while the sum is 46.

The spelling of 21764923732 in words is "twenty-one billion, seven hundred sixty-four million, nine hundred twenty-three thousand, seven hundred thirty-two".