12131122111 has 4 divisors (see below), whose sum is σ = 12244497192. Its totient is φ = 12017747032.

The previous prime is 12131122103. The next prime is 12131122177. The reversal of 12131122111 is 11122113121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11122113121 = 7 ⋅1588873303.

It is a cyclic number.

It is not a de Polignac number, because 12131122111 - 2³ = 12131122103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131122411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56687380 + ... + 56687593.

It is an arithmetic number, because the mean of its divisors is an integer number (3061124298).

Almost surely, 2^12131122111 is an apocalyptic number.

12131122111 is a deficient number, since it is larger than the sum of its proper divisors (113375081).

12131122111 is a wasteful number, since it uses less digits than its factorization.

12131122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113375080.

The product of its digits is 24, while the sum is 16.

Adding to 12131122111 its reverse (11122113121), we get a palindrome (23253235232).

The spelling of 12131122111 in words is "twelve billion, one hundred thirty-one million, one hundred twenty-two thousand, one hundred eleven".