13286921 has 4 divisors (see below), whose sum is σ = 13304592. Its totient is φ = 13269252.

The previous prime is 13286891. The next prime is 13286927. The reversal of 13286921 is 12968231.

13286921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12968231 = 73 ⋅177647.

It is a cyclic number.

It is not a de Polignac number, because 13286921 - 2⁶ = 13286857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13286927) 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, 7655 + ... + 9228.

It is an arithmetic number, because the mean of its divisors is an integer number (3326148).

Almost surely, 2^13286921 is an apocalyptic number.

It is an amenable number.

13286921 is a deficient number, since it is larger than the sum of its proper divisors (17671).

13286921 is an equidigital number, since it uses as much as digits as its factorization.

13286921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17670.

The product of its digits is 5184, while the sum is 32.

The square root of 13286921 is about 3645.1229060211. The cubic root of 13286921 is about 236.8507609044.

The spelling of 13286921 in words is "thirteen million, two hundred eighty-six thousand, nine hundred twenty-one".