123405336015121 has 2 divisors, whose sum is σ = 123405336015122. Its totient is φ = 123405336015120.

The previous prime is 123405336015061. The next prime is 123405336015161. The reversal of 123405336015121 is 121510633504321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86081655120400 + 37323680894721 = 9278020^2 + 6109311^2 .

It is a cyclic number.

It is not a de Polignac number, because 123405336015121 - 2⁷ = 123405336014993 is a prime.

It is not a weakly prime, because it can be changed into another prime (123405336015161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61702668007560 + 61702668007561.

It is an arithmetic number, because the mean of its divisors is an integer number (61702668007561).

Almost surely, 2^{123405336015121} is an apocalyptic number.

It is an amenable number.

123405336015121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123405336015121 is an equidigital number, since it uses as much as digits as its factorization.

123405336015121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

Adding to 123405336015121 its reverse (121510633504321), we get a palindrome (244915969519442).

The spelling of 123405336015121 in words is "one hundred twenty-three trillion, four hundred five billion, three hundred thirty-six million, fifteen thousand, one hundred twenty-one".