21756900588 has 12 divisors (see below), whose sum is σ = 50766101400. Its totient is φ = 7252300192.

The previous prime is 21756900587. The next prime is 21756900601. The reversal of 21756900588 is 88500965712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21756900588² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21756900588.

It is not an unprimeable number, because it can be changed into a prime (21756900587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906537513 + ... + 906537536.

It is an arithmetic number, because the mean of its divisors is an integer number (4230508450).

Almost surely, 2^21756900588 is an apocalyptic number.

It is an amenable number.

21756900588 is an abundant number, since it is smaller than the sum of its proper divisors (29009200812).

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

21756900588 is a wasteful number, since it uses less digits than its factorization.

21756900588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813075056 (or 1813075054 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 21756900588 in words is "twenty-one billion, seven hundred fifty-six million, nine hundred thousand, five hundred eighty-eight".