12131223111 has 12 divisors (see below), whose sum is σ = 20026146192. Its totient is φ = 6932127456.

The previous prime is 12131223107. The next prime is 12131223133. The reversal of 12131223111 is 11132213121.

12131223111 is a `hidden beast` number, since 121 + 312 + 231 + 1 + 1 = 666.

12131223111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12131223111 - 2² = 12131223107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131223191) 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 11 ways as a sum of consecutive naturals, for example, 96279486 + ... + 96279611.

It is an arithmetic number, because the mean of its divisors is an integer number (1668845516).

Almost surely, 2^12131223111 is an apocalyptic number.

12131223111 is a deficient number, since it is larger than the sum of its proper divisors (7894923081).

12131223111 is a wasteful number, since it uses less digits than its factorization.

12131223111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192559110 (or 192559107 counting only the distinct ones).

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

Adding to 12131223111 its reverse (11132213121), we get a palindrome (23263436232).

The spelling of 12131223111 in words is "twelve billion, one hundred thirty-one million, two hundred twenty-three thousand, one hundred eleven".