123255443225021 has 2 divisors, whose sum is σ = 123255443225022. Its totient is φ = 123255443225020.

The previous prime is 123255443225009. The next prime is 123255443225023. The reversal of 123255443225021 is 120522344552321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105736078668025 + 17519364556996 = 10282805^2 + 4185614^2 .

It is a cyclic number.

It is not a de Polignac number, because 123255443225021 - 2²⁶ = 123255376116157 is a prime.

Together with 123255443225023, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123255443225021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123255443225023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61627721612510 + 61627721612511.

It is an arithmetic number, because the mean of its divisors is an integer number (61627721612511).

Almost surely, 2^{123255443225021} is an apocalyptic number.

It is an amenable number.

123255443225021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123255443225021 is an equidigital number, since it uses as much as digits as its factorization.

123255443225021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576000, while the sum is 41.

Adding to 123255443225021 its reverse (120522344552321), we get a palindrome (243777787777342).

The spelling of 123255443225021 in words is "one hundred twenty-three trillion, two hundred fifty-five billion, four hundred forty-three million, two hundred twenty-five thousand, twenty-one".