13261321 has 4 divisors (see below), whose sum is σ = 13330944. Its totient is φ = 13191700.

The previous prime is 13261307. The next prime is 13261331. The reversal of 13261321 is 12316231.

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.

It is a cyclic number.

It is not a de Polignac number, because 13261321 - 2⁹ = 13260809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13261331) 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, 34525 + ... + 34906.

It is an arithmetic number, because the mean of its divisors is an integer number (3332736).

Almost surely, 2^13261321 is an apocalyptic number.

It is an amenable number.

13261321 is a deficient number, since it is larger than the sum of its proper divisors (69623).

13261321 is an equidigital number, since it uses as much as digits as its factorization.

13261321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69622.

The product of its digits is 216, while the sum is 19.

The square root of 13261321 is about 3641.6096715601. The cubic root of 13261321 is about 236.6985491223.

Adding to 13261321 its reverse (12316231), we get a palindrome (25577552).

The spelling of 13261321 in words is "thirteen million, two hundred sixty-one thousand, three hundred twenty-one".