21532623511 has 16 divisors (see below), whose sum is σ = 25507425600. Its totient is φ = 17785006848.

The previous prime is 21532623503. The next prime is 21532623533. The reversal of 21532623511 is 11532623512.

It is not a de Polignac number, because 21532623511 - 2³ = 21532623503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532623311) 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, 870 + ... + 207523.

It is an arithmetic number, because the mean of its divisors is an integer number (1594214100).

Almost surely, 2^21532623511 is an apocalyptic number.

21532623511 is a deficient number, since it is larger than the sum of its proper divisors (3974802089).

21532623511 is a wasteful number, since it uses less digits than its factorization.

21532623511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208938.

The product of its digits is 10800, while the sum is 31.

Subtracting from 21532623511 its reverse (11532623512), we obtain a palindrome (9999999999).

The spelling of 21532623511 in words is "twenty-one billion, five hundred thirty-two million, six hundred twenty-three thousand, five hundred eleven".