123111011223 has 12 divisors (see below), whose sum is σ = 177842048800. Its totient is φ = 82067069376.

The previous prime is 123111011161. The next prime is 123111011279. The reversal of 123111011223 is 322110111321.

It is not a de Polignac number, because 123111011223 - 2¹⁶ = 123110945687 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123111011196 and 123111011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111011623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 464623 + ... + 679776.

Almost surely, 2^123111011223 is an apocalyptic number.

123111011223 is a deficient number, since it is larger than the sum of its proper divisors (54731037577).

123111011223 is a wasteful number, since it uses less digits than its factorization.

123111011223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156358 (or 1156355 counting only the distinct ones).

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

Adding to 123111011223 its reverse (322110111321), we get a palindrome (445221122544).

The spelling of 123111011223 in words is "one hundred twenty-three billion, one hundred eleven million, eleven thousand, two hundred twenty-three".