21856593031 has 48 divisors (see below), whose sum is σ = 29087444736. Its totient is φ = 16221993984.

The previous prime is 21856592987. The next prime is 21856593043. The reversal of 21856593031 is 13039565812.

It is not a de Polignac number, because 21856593031 - 2¹¹ = 21856590983 is a prime.

It is a super-2 number, since 2×21856593031² (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 (21856593061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3429610 + ... + 3435976.

It is an arithmetic number, because the mean of its divisors is an integer number (605988432).

Almost surely, 2^21856593031 is an apocalyptic number.

21856593031 is a deficient number, since it is larger than the sum of its proper divisors (7230851705).

21856593031 is a wasteful number, since it uses less digits than its factorization.

21856593031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6728 (or 6721 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 21856593031 in words is "twenty-one billion, eight hundred fifty-six million, five hundred ninety-three thousand, thirty-one".