123123125321 has 4 divisors (see below), whose sum is σ = 140712143232. Its totient is φ = 105534107412.

The previous prime is 123123125299. The next prime is 123123125353. The reversal of 123123125321 is 123521321321.

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 a de Polignac number, because none of the positive numbers 2^k-123123125321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123123125921) 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, 8794508945 + ... + 8794508958.

It is an arithmetic number, because the mean of its divisors is an integer number (35178035808).

Almost surely, 2^123123125321 is an apocalyptic number.

It is an amenable number.

123123125321 is a deficient number, since it is larger than the sum of its proper divisors (17589017911).

123123125321 is an equidigital number, since it uses as much as digits as its factorization.

123123125321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17589017910.

The product of its digits is 2160, while the sum is 26.

Adding to 123123125321 its reverse (123521321321), we get a palindrome (246644446642).

The spelling of 123123125321 in words is "one hundred twenty-three billion, one hundred twenty-three million, one hundred twenty-five thousand, three hundred twenty-one".