21536514552 has 64 divisors (see below), whose sum is σ = 61584710400. Its totient is φ = 6148108800.

The previous prime is 21536514541. The next prime is 21536514599. The reversal of 21536514552 is 25541563512.

It is a self number, because there is not a number n which added to its sum of digits gives 21536514552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148399 + ... + 255137.

It is an arithmetic number, because the mean of its divisors is an integer number (962261100).

Almost surely, 2^21536514552 is an apocalyptic number.

It is an amenable number.

21536514552 is an abundant number, since it is smaller than the sum of its proper divisors (40048195848).

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

21536514552 is a wasteful number, since it uses less digits than its factorization.

21536514552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107956 (or 107952 counting only the distinct ones).

The product of its digits is 180000, while the sum is 39.

The spelling of 21536514552 in words is "twenty-one billion, five hundred thirty-six million, five hundred fourteen thousand, five hundred fifty-two".