121111111231223 has 2 divisors, whose sum is σ = 121111111231224. Its totient is φ = 121111111231222.

The previous prime is 121111111231193. The next prime is 121111111231247. The reversal of 121111111231223 is 322132111111121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121111111231223 - 2¹⁰ = 121111111230199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111111231273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555555615611 + 60555555615612.

It is an arithmetic number, because the mean of its divisors is an integer number (60555555615612).

Almost surely, 2^{121111111231223} is an apocalyptic number.

121111111231223 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111111231223 is an equidigital number, since it uses as much as digits as its factorization.

121111111231223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 23.

Adding to 121111111231223 its reverse (322132111111121), we get a palindrome (443243222342344).

The spelling of 121111111231223 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, two hundred thirty-one thousand, two hundred twenty-three".