123012131321 has 4 divisors (see below), whose sum is σ = 123151443792. Its totient is φ = 122872818852.

The previous prime is 123012131317. The next prime is 123012131381. The reversal of 123012131321 is 123131210321.

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 a cyclic number.

It is not a de Polignac number, because 123012131321 - 2² = 123012131317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123012131293 and 123012131302.

It is not an unprimeable number, because it can be changed into a prime (123012131381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69654911 + ... + 69656676.

It is an arithmetic number, because the mean of its divisors is an integer number (30787860948).

Almost surely, 2^123012131321 is an apocalyptic number.

It is an amenable number.

123012131321 is a deficient number, since it is larger than the sum of its proper divisors (139312471).

123012131321 is an equidigital number, since it uses as much as digits as its factorization.

123012131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139312470.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 123012131321 its reverse (123131210321), we get a palindrome (246143341642).

The spelling of 123012131321 in words is "one hundred twenty-three billion, twelve million, one hundred thirty-one thousand, three hundred twenty-one".