12122531111 has 4 divisors (see below), whose sum is σ = 12327997800. Its totient is φ = 11917064424.

The previous prime is 12122531089. The next prime is 12122531129. The reversal of 12122531111 is 11113522121.

12122531111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12122531111 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 (12122531611) 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, 102733256 + ... + 102733373.

It is an arithmetic number, because the mean of its divisors is an integer number (3081999450).

Almost surely, 2^12122531111 is an apocalyptic number.

12122531111 is a deficient number, since it is larger than the sum of its proper divisors (205466689).

12122531111 is an equidigital number, since it uses as much as digits as its factorization.

12122531111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205466688.

The product of its digits is 120, while the sum is 20.

The spelling of 12122531111 in words is "twelve billion, one hundred twenty-two million, five hundred thirty-one thousand, one hundred eleven".