23111431121 has 4 divisors (see below), whose sum is σ = 23125051812. Its totient is φ = 23097810432.

The previous prime is 23111431117. The next prime is 23111431127. The reversal of 23111431121 is 12113411132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9343928896 + 13767502225 = 96664^2 + 117335^2 .

It is a cyclic number.

It is not a de Polignac number, because 23111431121 - 2² = 23111431117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23111431093 and 23111431102.

It is not an unprimeable number, because it can be changed into a prime (23111431127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6807800 + ... + 6811193.

It is an arithmetic number, because the mean of its divisors is an integer number (5781262953).

Almost surely, 2^23111431121 is an apocalyptic number.

It is an amenable number.

23111431121 is a deficient number, since it is larger than the sum of its proper divisors (13620691).

23111431121 is a wasteful number, since it uses less digits than its factorization.

23111431121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13620690.

The product of its digits is 144, while the sum is 20.

Adding to 23111431121 its reverse (12113411132), we get a palindrome (35224842253).

The spelling of 23111431121 in words is "twenty-three billion, one hundred eleven million, four hundred thirty-one thousand, one hundred twenty-one".