123013203305021 has 2 divisors, whose sum is σ = 123013203305022. Its totient is φ = 123013203305020.

The previous prime is 123013203305011. The next prime is 123013203305131. The reversal of 123013203305021 is 120503302310321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112747657792900 + 10265545512121 = 10618270^2 + 3203989^2 .

It is a cyclic number.

It is not a de Polignac number, because 123013203305021 - 2³⁴ = 122996023435837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123013203305011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61506601652510 + 61506601652511.

It is an arithmetic number, because the mean of its divisors is an integer number (61506601652511).

Almost surely, 2^{123013203305021} is an apocalyptic number.

It is an amenable number.

123013203305021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123013203305021 is an equidigital number, since it uses as much as digits as its factorization.

123013203305021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 123013203305021 its reverse (120503302310321), we get a palindrome (243516505615342).

The spelling of 123013203305021 in words is "one hundred twenty-three trillion, thirteen billion, two hundred three million, three hundred five thousand, twenty-one".