21813734572 has 24 divisors (see below), whose sum is σ = 43630666016. Its totient is φ = 9348058368.

The previous prime is 21813734563. The next prime is 21813734597. The reversal of 21813734572 is 27543731812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614788 + ... + 649300.

Almost surely, 2^21813734572 is an apocalyptic number.

It is an amenable number.

21813734572 is an abundant number, since it is smaller than the sum of its proper divisors (21816931444).

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

21813734572 is a wasteful number, since it uses less digits than its factorization.

21813734572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57097 (or 57095 counting only the distinct ones).

The product of its digits is 282240, while the sum is 43.

The spelling of 21813734572 in words is "twenty-one billion, eight hundred thirteen million, seven hundred thirty-four thousand, five hundred seventy-two".