13140321 has 4 divisors (see below), whose sum is σ = 17520432. Its totient is φ = 8760212.

The previous prime is 13140317. The next prime is 13140329. The reversal of 13140321 is 12304131.

13140321 is digitally balanced in base 3, 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.

It is a cyclic number.

It is not a de Polignac number, because 13140321 - 2² = 13140317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13140321.

It is not an unprimeable number, because it can be changed into a prime (13140329) 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, 2190051 + ... + 2190056.

It is an arithmetic number, because the mean of its divisors is an integer number (4380108).

Almost surely, 2^13140321 is an apocalyptic number.

It is an amenable number.

13140321 is a deficient number, since it is larger than the sum of its proper divisors (4380111).

13140321 is an equidigital number, since it uses as much as digits as its factorization.

13140321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380110.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 13140321 is about 3624.9580687230. The cubic root of 13140321 is about 235.9764471851.

Adding to 13140321 its reverse (12304131), we get a palindrome (25444452).

The spelling of 13140321 in words is "thirteen million, one hundred forty thousand, three hundred twenty-one".