13221140321 has 4 divisors (see below), whose sum is σ = 13246420272. Its totient is φ = 13195860372.

The previous prime is 13221140269. The next prime is 13221140323. The reversal of 13221140321 is 12304112231.

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 a de Polignac number, because none of the positive numbers 2^k-13221140321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13221140293 and 13221140302.

It is not an unprimeable number, because it can be changed into a prime (13221140323) 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, 12639191 + ... + 12640236.

It is an arithmetic number, because the mean of its divisors is an integer number (3311605068).

Almost surely, 2^13221140321 is an apocalyptic number.

It is an amenable number.

13221140321 is a deficient number, since it is larger than the sum of its proper divisors (25279951).

13221140321 is an equidigital number, since it uses as much as digits as its factorization.

13221140321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25279950.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 13221140321 its reverse (12304112231), we get a palindrome (25525252552).

The spelling of 13221140321 in words is "thirteen billion, two hundred twenty-one million, one hundred forty thousand, three hundred twenty-one".