13106321 has 4 divisors (see below), whose sum is σ = 13115700. Its totient is φ = 13096944.

The previous prime is 13106293. The next prime is 13106329. The reversal of 13106321 is 12360131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7980625 + 5125696 = 2825^2 + 2264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13106321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13106321.

It is not an unprimeable number, because it can be changed into a prime (13106329) 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, 2126 + ... + 5543.

It is an arithmetic number, because the mean of its divisors is an integer number (3278925).

Almost surely, 2^13106321 is an apocalyptic number.

It is an amenable number.

13106321 is a deficient number, since it is larger than the sum of its proper divisors (9379).

13106321 is an equidigital number, since it uses as much as digits as its factorization.

13106321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9378.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 13106321 is about 3620.2653217686. The cubic root of 13106321 is about 235.7727451837.

Adding to 13106321 its reverse (12360131), we get a palindrome (25466452).

The spelling of 13106321 in words is "thirteen million, one hundred six thousand, three hundred twenty-one".