12133231111 has 4 divisors (see below), whose sum is σ = 12137660424. Its totient is φ = 12128801800.

The previous prime is 12133231093. The next prime is 12133231133. The reversal of 12133231111 is 11113233121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11113233121 = 31 ⋅358491391.

It is a cyclic number.

It is not a de Polignac number, because 12133231111 - 2²⁹ = 11596360199 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 (12133237111) 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, 2210545 + ... + 2216026.

It is an arithmetic number, because the mean of its divisors is an integer number (3034415106).

Almost surely, 2^12133231111 is an apocalyptic number.

12133231111 is a deficient number, since it is larger than the sum of its proper divisors (4429313).

12133231111 is an equidigital number, since it uses as much as digits as its factorization.

12133231111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4429312.

The product of its digits is 108, while the sum is 19.

Adding to 12133231111 its reverse (11113233121), we get a palindrome (23246464232).

The spelling of 12133231111 in words is "twelve billion, one hundred thirty-three million, two hundred thirty-one thousand, one hundred eleven".