12111111223 has 4 divisors (see below), whose sum is σ = 12111331480. Its totient is φ = 12110890968.

The previous prime is 12111111211. The next prime is 12111111269. The reversal of 12111111223 is 32211111121.

It is a happy number.

12111111223 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32211111121 = 7 ⋅4601587303.

It is a cyclic number.

It is not a de Polignac number, because 12111111223 - 2¹⁷ = 12110980151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111111197 and 12111111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111111323) 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, 48868 + ... + 163126.

It is an arithmetic number, because the mean of its divisors is an integer number (3027832870).

Almost surely, 2^12111111223 is an apocalyptic number.

12111111223 is a deficient number, since it is larger than the sum of its proper divisors (220257).

12111111223 is a wasteful number, since it uses less digits than its factorization.

12111111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220256.

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

Adding to 12111111223 its reverse (32211111121), we get a palindrome (44322222344).

The spelling of 12111111223 in words is "twelve billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-three".