123012111121 has 4 divisors (see below), whose sum is σ = 123096425200. Its totient is φ = 122927797044.

The previous prime is 123012111109. The next prime is 123012111133. The reversal of 123012111121 is 121111210321.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (123012111109) and next prime (123012111133).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123012111121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123012111095 and 123012111104.

It is not an unprimeable number, because it can be changed into a prime (123012111221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42154851 + ... + 42157768.

It is an arithmetic number, because the mean of its divisors is an integer number (30774106300).

Almost surely, 2^123012111121 is an apocalyptic number.

It is an amenable number.

123012111121 is a deficient number, since it is larger than the sum of its proper divisors (84314079).

123012111121 is an equidigital number, since it uses as much as digits as its factorization.

123012111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84314078.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 123012111121 its reverse (121111210321), we get a palindrome (244123321442).

The spelling of 123012111121 in words is "one hundred twenty-three billion, twelve million, one hundred eleven thousand, one hundred twenty-one".