123112112312221 has 2 divisors, whose sum is σ = 123112112312222. Its totient is φ = 123112112312220.

The previous prime is 123112112312213. The next prime is 123112112312251. The reversal of 123112112312221 is 122213211211321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120661744728996 + 2450367583225 = 10984614^2 + 1565365^2 .

It is a cyclic number.

It is not a de Polignac number, because 123112112312221 - 2³ = 123112112312213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123112112312251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61556056156110 + 61556056156111.

It is an arithmetic number, because the mean of its divisors is an integer number (61556056156111).

Almost surely, 2^{123112112312221} is an apocalyptic number.

It is an amenable number.

123112112312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123112112312221 is an equidigital number, since it uses as much as digits as its factorization.

123112112312221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

Adding to 123112112312221 its reverse (122213211211321), we get a palindrome (245325323523542).

The spelling of 123112112312221 in words is "one hundred twenty-three trillion, one hundred twelve billion, one hundred twelve million, three hundred twelve thousand, two hundred twenty-one".