13221320323 has 4 divisors (see below), whose sum is σ = 13222700200. Its totient is φ = 13219940448.

The previous prime is 13221320317. The next prime is 13221320339. The reversal of 13221320323 is 32302312231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32302312231 = 7 ⋅4614616033.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13221320323 is a prime.

It is a super-3 number, since 3×13221320323³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13221320294 and 13221320303.

It is not an unprimeable number, because it can be changed into a prime (13221329323) 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, 675465 + ... + 694762.

It is an arithmetic number, because the mean of its divisors is an integer number (3305675050).

Almost surely, 2^13221320323 is an apocalyptic number.

13221320323 is a deficient number, since it is larger than the sum of its proper divisors (1379877).

13221320323 is an equidigital number, since it uses as much as digits as its factorization.

13221320323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379876.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 13221320323 its reverse (32302312231), we get a palindrome (45523632554).

The spelling of 13221320323 in words is "thirteen billion, two hundred twenty-one million, three hundred twenty thousand, three hundred twenty-three".