21533869056 has 88 divisors (see below), whose sum is σ = 65595050560. Its totient is φ = 6152527872.

The previous prime is 21533869033. The next prime is 21533869103. The reversal of 21533869056 is 65096833512.

It is a super-2 number, since 2×21533869056² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 21533868996 and 21533869014.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 479191 + ... + 522198.

Almost surely, 2^21533869056 is an apocalyptic number.

It is an amenable number.

21533869056 is an abundant number, since it is smaller than the sum of its proper divisors (44061181504).

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

21533869056 is a wasteful number, since it uses less digits than its factorization.

21533869056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001419 (or 1001401 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 21533869056 in words is "twenty-one billion, five hundred thirty-three million, eight hundred sixty-nine thousand, fifty-six".