21753024381 has 72 divisors (see below), whose sum is σ = 36184512000. Its totient is φ = 12566473920.

The previous prime is 21753024367. The next prime is 21753024409. The reversal of 21753024381 is 18342035712.

21753024381 is a `hidden beast` number, since 2 + 1 + 7 + 530 + 2 + 43 + 81 = 666.

It is not a de Polignac number, because 21753024381 - 2¹⁵ = 21752991613 is a prime.

It is a super-2 number, since 2×21753024381² (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 (21753024301) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2490540 + ... + 2499258.

Almost surely, 2^21753024381 is an apocalyptic number.

It is an amenable number.

21753024381 is a deficient number, since it is larger than the sum of its proper divisors (14431487619).

21753024381 is a wasteful number, since it uses less digits than its factorization.

21753024381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8855 (or 8841 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 21753024381 in words is "twenty-one billion, seven hundred fifty-three million, twenty-four thousand, three hundred eighty-one".