13286521421 has 4 divisors (see below), whose sum is σ = 13286777244. Its totient is φ = 13286265600.

The previous prime is 13286521397. The next prime is 13286521487. The reversal of 13286521421 is 12412568231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8097480196 + 5189041225 = 89986^2 + 72035^2 .

It is a cyclic number.

It is not a de Polignac number, because 13286521421 - 2³⁰ = 12212779597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13286521621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19220 + ... + 164141.

It is an arithmetic number, because the mean of its divisors is an integer number (3321694311).

Almost surely, 2^13286521421 is an apocalyptic number.

It is an amenable number.

13286521421 is a deficient number, since it is larger than the sum of its proper divisors (255823).

13286521421 is an equidigital number, since it uses as much as digits as its factorization.

13286521421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255822.

The product of its digits is 23040, while the sum is 35.

The spelling of 13286521421 in words is "thirteen billion, two hundred eighty-six million, five hundred twenty-one thousand, four hundred twenty-one".