123113121111 has 24 divisors (see below), whose sum is σ = 179526634560. Its totient is φ = 81293377536.

The previous prime is 123113121041. The next prime is 123113121143. The reversal of 123113121111 is 111121311321.

It is not a de Polignac number, because 123113121111 - 2²³ = 123104732503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123113125111) 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 23 ways as a sum of consecutive naturals, for example, 1471575 + ... + 1552983.

It is an arithmetic number, because the mean of its divisors is an integer number (7480276440).

Almost surely, 2^123113121111 is an apocalyptic number.

123113121111 is a deficient number, since it is larger than the sum of its proper divisors (56413513449).

123113121111 is a wasteful number, since it uses less digits than its factorization.

123113121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83015 (or 83012 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

Adding to 123113121111 its reverse (111121311321), we get a palindrome (234234432432).

The spelling of 123113121111 in words is "one hundred twenty-three billion, one hundred thirteen million, one hundred twenty-one thousand, one hundred eleven".