121111011231223 has 16 divisors (see below), whose sum is σ = 130489440925536. Its totient is φ = 111741470121600.

The previous prime is 121111011231211. The next prime is 121111011231239. The reversal of 121111011231223 is 322132110111121.

It is a cyclic number.

It is not a de Polignac number, because 121111011231223 - 2³⁷ = 120973572277751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111011231194 and 121111011231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111011231263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1866056073 + ... + 1866120973.

It is an arithmetic number, because the mean of its divisors is an integer number (8155590057846).

Almost surely, 2^{121111011231223} is an apocalyptic number.

121111011231223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121111011231223 is a deficient number, since it is larger than the sum of its proper divisors (9378429694313).

121111011231223 is a wasteful number, since it uses less digits than its factorization.

121111011231223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131154.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 121111011231223 its reverse (322132110111121), we get a palindrome (443243121342344).

The spelling of 121111011231223 in words is "one hundred twenty-one trillion, one hundred eleven billion, eleven million, two hundred thirty-one thousand, two hundred twenty-three".