23111121213 has 6 divisors (see below), whose sum is σ = 33382730654. Its totient is φ = 15407414136.

The previous prime is 23111121193. The next prime is 23111121227. The reversal of 23111121213 is 31212111132.

It can be written as a sum of positive squares in only one way, i.e., 17941798809 + 5169322404 = 133947^2 + 71898^2 .

It is not a de Polignac number, because 23111121213 - 2¹³ = 23111113021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23111111213) 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 5 ways as a sum of consecutive naturals, for example, 1283951170 + ... + 1283951187.

Almost surely, 2^23111121213 is an apocalyptic number.

It is an amenable number.

23111121213 is a deficient number, since it is larger than the sum of its proper divisors (10271609441).

23111121213 is a wasteful number, since it uses less digits than its factorization.

23111121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567902363 (or 2567902360 counting only the distinct ones).

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

Adding to 23111121213 its reverse (31212111132), we get a palindrome (54323232345).

It can be divided in two parts, 2311112 and 1213, that added together give a triangular number (2312325 = T₂₁₅₀).

The spelling of 23111121213 in words is "twenty-three billion, one hundred eleven million, one hundred twenty-one thousand, two hundred thirteen".