21852591063 has 16 divisors (see below), whose sum is σ = 29208416256. Its totient is φ = 14532616800.

The previous prime is 21852591043. The next prime is 21852591071. The reversal of 21852591063 is 36019525812.

It is not a de Polignac number, because 21852591063 - 2²⁰ = 21851542487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852591023) 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, 3256770 + ... + 3263472.

It is an arithmetic number, because the mean of its divisors is an integer number (1825526016).

Almost surely, 2^21852591063 is an apocalyptic number.

21852591063 is a deficient number, since it is larger than the sum of its proper divisors (7355825193).

21852591063 is a wasteful number, since it uses less digits than its factorization.

21852591063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9214.

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 21852591063 in words is "twenty-one billion, eight hundred fifty-two million, five hundred ninety-one thousand, sixty-three".