13123255213921 has 2 divisors, whose sum is σ = 13123255213922. Its totient is φ = 13123255213920.

The previous prime is 13123255213639. The next prime is 13123255214039. The reversal of 13123255213921 is 12931255232131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11756916314896 + 1366338899025 = 3428836^2 + 1168905^2 .

It is a cyclic number.

It is not a de Polignac number, because 13123255213921 - 2³³ = 13114665279329 is a prime.

It is a super-2 number, since 2×13123255213921² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13123255210921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6561627606960 + 6561627606961.

It is an arithmetic number, because the mean of its divisors is an integer number (6561627606961).

Almost surely, 2^{13123255213921} is an apocalyptic number.

It is an amenable number.

13123255213921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13123255213921 is an equidigital number, since it uses as much as digits as its factorization.

13123255213921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 40.

The spelling of 13123255213921 in words is "thirteen trillion, one hundred twenty-three billion, two hundred fifty-five million, two hundred thirteen thousand, nine hundred twenty-one".