123123121 has 4 divisors (see below), whose sum is σ = 134316144. Its totient is φ = 111930100.

The previous prime is 123123107. The next prime is 123123137. The reversal of 123123121 is 121321321.

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 123123121 - 2²¹ = 121025969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123123095 and 123123104.

It is not an unprimeable number, because it can be changed into a prime (123123151) 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, 5596495 + ... + 5596516.

It is an arithmetic number, because the mean of its divisors is an integer number (33579036).

Almost surely, 2^123123121 is an apocalyptic number.

123123121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123123121 is a deficient number, since it is larger than the sum of its proper divisors (11193023).

123123121 is a wasteful number, since it uses less digits than its factorization.

123123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11193022.

The product of its digits is 72, while the sum is 16.

The square root of 123123121 is about 11096.0858414127. The cubic root of 123123121 is about 497.4848640631.

Adding to 123123121 its reverse (121321321), we get a palindrome (244444442).

The spelling of 123123121 in words is "one hundred twenty-three million, one hundred twenty-three thousand, one hundred twenty-one".