21112323321 has 64 divisors (see below), whose sum is σ = 30805171200. Its totient is φ = 12831436800.

The previous prime is 21112323311. The next prime is 21112323391. The reversal of 21112323321 is 12332321112.

It is not a de Polignac number, because 21112323321 - 2⁶ = 21112323257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112323311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15511681 + ... + 15513041.

It is an arithmetic number, because the mean of its divisors is an integer number (481330800).

Almost surely, 2^21112323321 is an apocalyptic number.

It is an amenable number.

21112323321 is a deficient number, since it is larger than the sum of its proper divisors (9692847879).

21112323321 is a wasteful number, since it uses less digits than its factorization.

21112323321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570.

The product of its digits is 432, while the sum is 21.

Adding to 21112323321 its reverse (12332321112), we get a palindrome (33444644433).

The spelling of 21112323321 in words is "twenty-one billion, one hundred twelve million, three hundred twenty-three thousand, three hundred twenty-one".