21533023488 has 36 divisors (see below), whose sum is σ = 57309246848. Its totient is φ = 7177674240.

The previous prime is 21533023487. The next prime is 21533023493. The reversal of 21533023488 is 88432033512.

It is a super-2 number, since 2×21533023488² (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 (21533023481) 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, 14018128 + ... + 14019663.

Almost surely, 2^21533023488 is an apocalyptic number.

It is an amenable number.

21533023488 is an abundant number, since it is smaller than the sum of its proper divisors (35776223360).

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

21533023488 is an equidigital number, since it uses as much as digits as its factorization.

21533023488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28037810 (or 28037796 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 21533023488 in words is "twenty-one billion, five hundred thirty-three million, twenty-three thousand, four hundred eighty-eight".