13521422412521 has 2 divisors, whose sum is σ = 13521422412522. Its totient is φ = 13521422412520.

The previous prime is 13521422412503. The next prime is 13521422412551. The reversal of 13521422412521 is 12521422412531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13136819025625 + 384603386896 = 3624475^2 + 620164^2 .

It is a cyclic number.

It is not a de Polignac number, because 13521422412521 - 2²⁶ = 13521355303657 is a prime.

It is not a weakly prime, because it can be changed into another prime (13521422412551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760711206260 + 6760711206261.

It is an arithmetic number, because the mean of its divisors is an integer number (6760711206261).

Almost surely, 2^{13521422412521} is an apocalyptic number.

It is an amenable number.

13521422412521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13521422412521 is an equidigital number, since it uses as much as digits as its factorization.

13521422412521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 35.

The spelling of 13521422412521 in words is "thirteen trillion, five hundred twenty-one billion, four hundred twenty-two million, four hundred twelve thousand, five hundred twenty-one".