21718335552 has 56 divisors (see below), whose sum is σ = 57503543616. Its totient is φ = 7234349568.

The previous prime is 21718335521. The next prime is 21718335563. The reversal of 21718335552 is 25553381712.

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, 238738 + ... + 316910.

Almost surely, 2^21718335552 is an apocalyptic number.

It is an amenable number.

21718335552 is an abundant number, since it is smaller than the sum of its proper divisors (35785208064).

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

21718335552 is a wasteful number, since it uses less digits than its factorization.

21718335552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79635 (or 79625 counting only the distinct ones).

The product of its digits is 252000, while the sum is 42.

The spelling of 21718335552 in words is "twenty-one billion, seven hundred eighteen million, three hundred thirty-five thousand, five hundred fifty-two".