21593794288 has 20 divisors (see below), whose sum is σ = 45641429208. Its totient is φ = 9815360960.

The previous prime is 21593794259. The next prime is 21593794289. The reversal of 21593794288 is 88249739512.

It is a super-2 number, since 2×21593794288² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21593794289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61345831 + ... + 61346182.

Almost surely, 2^21593794288 is an apocalyptic number.

It is an amenable number.

21593794288 is an abundant number, since it is smaller than the sum of its proper divisors (24047634920).

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

21593794288 is a wasteful number, since it uses less digits than its factorization.

21593794288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122692032 (or 122692026 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 58.

The spelling of 21593794288 in words is "twenty-one billion, five hundred ninety-three million, seven hundred ninety-four thousand, two hundred eighty-eight".