13256000121409 has 2 divisors, whose sum is σ = 13256000121410. Its totient is φ = 13256000121408.

The previous prime is 13256000121383. The next prime is 13256000121437. The reversal of 13256000121409 is 90412100065231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8068866330625 + 5187133790784 = 2840575^2 + 2277528^2 .

It is a cyclic number.

It is not a de Polignac number, because 13256000121409 - 2¹¹ = 13256000119361 is a prime.

It is not a weakly prime, because it can be changed into another prime (13256000121449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6628000060704 + 6628000060705.

It is an arithmetic number, because the mean of its divisors is an integer number (6628000060705).

Almost surely, 2^{13256000121409} is an apocalyptic number.

It is an amenable number.

13256000121409 is a deficient number, since it is larger than the sum of its proper divisors (1).

13256000121409 is an equidigital number, since it uses as much as digits as its factorization.

13256000121409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 13256000121409 in words is "thirteen trillion, two hundred fifty-six billion, one hundred twenty-one thousand, four hundred nine".