123131323321 has 4 divisors (see below), whose sum is σ = 125994842512. Its totient is φ = 120267804132.

The previous prime is 123131323319. The next prime is 123131323327. The reversal of 123131323321 is 123323131321.

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 123131323321 - 2¹ = 123131323319 is a prime.

It is a super-2 number, since 2×123131323321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123131323327) 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, 1431759531 + ... + 1431759616.

It is an arithmetic number, because the mean of its divisors is an integer number (31498710628).

Almost surely, 2^123131323321 is an apocalyptic number.

It is an amenable number.

123131323321 is a deficient number, since it is larger than the sum of its proper divisors (2863519191).

123131323321 is an equidigital number, since it uses as much as digits as its factorization.

123131323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863519190.

The product of its digits is 1944, while the sum is 25.

Adding to 123131323321 its reverse (123323131321), we get a palindrome (246454454642).

The spelling of 123131323321 in words is "one hundred twenty-three billion, one hundred thirty-one million, three hundred twenty-three thousand, three hundred twenty-one".