21323111121 has 48 divisors (see below), whose sum is σ = 34409007360. Its totient is φ = 12639594240.

The previous prime is 21323111093. The next prime is 21323111129. The reversal of 21323111121 is 12111132312.

It is not a de Polignac number, because 21323111121 - 2⁷ = 21323110993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21323111094 and 21323111103.

It is not an unprimeable number, because it can be changed into a prime (21323111129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 350830 + ... + 407096.

It is an arithmetic number, because the mean of its divisors is an integer number (716854320).

Almost surely, 2^21323111121 is an apocalyptic number.

It is an amenable number.

21323111121 is a deficient number, since it is larger than the sum of its proper divisors (13085896239).

21323111121 is a wasteful number, since it uses less digits than its factorization.

21323111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56406 (or 56403 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 21323111121 its reverse (12111132312), we get a palindrome (33434243433).

The spelling of 21323111121 in words is "twenty-one billion, three hundred twenty-three million, one hundred eleven thousand, one hundred twenty-one".