123131033231321 has 2 divisors, whose sum is σ = 123131033231322. Its totient is φ = 123131033231320.

The previous prime is 123131033231267. The next prime is 123131033231341. The reversal of 123131033231321 is 123132330131321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109439634595600 + 13691398635721 = 10461340^2 + 3700189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123131033231321 is a prime.

It is a super-2 number, since 2×123131033231321² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123131033231341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61565516615660 + 61565516615661.

It is an arithmetic number, because the mean of its divisors is an integer number (61565516615661).

Almost surely, 2^{123131033231321} is an apocalyptic number.

It is an amenable number.

123131033231321 is a deficient number, since it is larger than the sum of its proper divisors (1).

123131033231321 is an equidigital number, since it uses as much as digits as its factorization.

123131033231321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 29.

Adding to 123131033231321 its reverse (123132330131321), we get a palindrome (246263363362642).

The spelling of 123131033231321 in words is "one hundred twenty-three trillion, one hundred thirty-one billion, thirty-three million, two hundred thirty-one thousand, three hundred twenty-one".