21703511072 has 24 divisors (see below), whose sum is σ = 42755643756. Its totient is φ = 10844934912.

The previous prime is 21703511051. The next prime is 21703511101. The reversal of 21703511072 is 27011530712.

It can be written as a sum of positive squares in 2 ways, for example, as 21431788816 + 271722256 = 146396^2 + 16484^2 .

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, 161243 + ... + 263450.

Almost surely, 2^21703511072 is an apocalyptic number.

It is an amenable number.

21703511072 is a deficient number, since it is larger than the sum of its proper divisors (21052132684).

21703511072 is a wasteful number, since it uses less digits than its factorization.

21703511072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426300 (or 426292 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The spelling of 21703511072 in words is "twenty-one billion, seven hundred three million, five hundred eleven thousand, seventy-two".