21504060563 has 16 divisors (see below), whose sum is σ = 23888828160. Its totient is φ = 19265126400.

The previous prime is 21504060491. The next prime is 21504060593. The reversal of 21504060563 is 36506040512.

It is a cyclic number.

It is not a de Polignac number, because 21504060563 - 2²⁴ = 21487283347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21504060593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302318 + ... + 366611.

It is an arithmetic number, because the mean of its divisors is an integer number (1493051760).

Almost surely, 2^21504060563 is an apocalyptic number.

21504060563 is a deficient number, since it is larger than the sum of its proper divisors (2384767597).

21504060563 is a wasteful number, since it uses less digits than its factorization.

21504060563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669038.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 21504060563 in words is "twenty-one billion, five hundred four million, sixty thousand, five hundred sixty-three".