123111212101121 has 4 divisors (see below), whose sum is σ = 123120573471744. Its totient is φ = 123101850730500.

The previous prime is 123111212101117. The next prime is 123111212101139. The reversal of 123111212101121 is 121101212111321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123111212101121 - 2² = 123111212101117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123111212101093 and 123111212101102.

It is not an unprimeable number, because it can be changed into a prime (123111212101151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4680665585 + ... + 4680691886.

It is an arithmetic number, because the mean of its divisors is an integer number (30780143367936).

Almost surely, 2^{123111212101121} is an apocalyptic number.

It is an amenable number.

123111212101121 is a deficient number, since it is larger than the sum of its proper divisors (9361370623).

123111212101121 is an equidigital number, since it uses as much as digits as its factorization.

123111212101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9361370622.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 123111212101121 its reverse (121101212111321), we get a palindrome (244212424212442).

The spelling of 123111212101121 in words is "one hundred twenty-three trillion, one hundred eleven billion, two hundred twelve million, one hundred one thousand, one hundred twenty-one".