123012111123 has 24 divisors (see below), whose sum is σ = 195719197440. Its totient is φ = 73828974960.

The previous prime is 123012111109. The next prime is 123012111133. The reversal of 123012111123 is 321111210321.

It is not a de Polignac number, because 123012111123 - 2⁴ = 123012111107 is a prime.

It is a super-2 number, since 2×123012111123² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123012111096 and 123012111105.

It is not an unprimeable number, because it can be changed into a prime (123012111133) 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, 6021583 + ... + 6041976.

It is an arithmetic number, because the mean of its divisors is an integer number (8154966560).

Almost surely, 2^123012111123 is an apocalyptic number.

123012111123 is a deficient number, since it is larger than the sum of its proper divisors (72707086317).

123012111123 is a wasteful number, since it uses less digits than its factorization.

123012111123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12063679 (or 12063676 counting only the distinct ones).

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

Adding to 123012111123 its reverse (321111210321), we get a palindrome (444123321444).

The spelling of 123012111123 in words is "one hundred twenty-three billion, twelve million, one hundred eleven thousand, one hundred twenty-three".