21575263063 has 4 divisors (see below), whose sum is σ = 21589754320. Its totient is φ = 21560771808.

The previous prime is 21575262959. The next prime is 21575263067. The reversal of 21575263063 is 36036257512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21575263063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21575263067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7243395 + ... + 7246372.

It is an arithmetic number, because the mean of its divisors is an integer number (5397438580).

Almost surely, 2^21575263063 is an apocalyptic number.

21575263063 is a deficient number, since it is larger than the sum of its proper divisors (14491257).

21575263063 is a wasteful number, since it uses less digits than its factorization.

21575263063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14491256.

The product of its (nonzero) digits is 226800, while the sum is 40.

The spelling of 21575263063 in words is "twenty-one billion, five hundred seventy-five million, two hundred sixty-three thousand, sixty-three".