21731504362 has 32 divisors (see below), whose sum is σ = 34799587200. Its totient is φ = 10142350848.

The previous prime is 21731504359. The next prime is 21731504369. The reversal of 21731504362 is 26340513712.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (21731504369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6156214 + ... + 6159742.

It is an arithmetic number, because the mean of its divisors is an integer number (1087487100).

Almost surely, 2^21731504362 is an apocalyptic number.

21731504362 is a deficient number, since it is larger than the sum of its proper divisors (13068082838).

21731504362 is a wasteful number, since it uses less digits than its factorization.

21731504362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4990.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 21731504362 in words is "twenty-one billion, seven hundred thirty-one million, five hundred four thousand, three hundred sixty-two".