13221020323 has 4 divisors (see below), whose sum is σ = 15109737520. Its totient is φ = 11332303128.

The previous prime is 13221020311. The next prime is 13221020341. The reversal of 13221020323 is 32302012231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32302012231 = 127 ⋅254346553.

It is a cyclic number.

It is not a de Polignac number, because 13221020323 - 2¹⁷ = 13220889251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13221020323.

It is not an unprimeable number, because it can be changed into a prime (13221020303) 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, 944358588 + ... + 944358601.

It is an arithmetic number, because the mean of its divisors is an integer number (3777434380).

Almost surely, 2^13221020323 is an apocalyptic number.

13221020323 is a deficient number, since it is larger than the sum of its proper divisors (1888717197).

13221020323 is an equidigital number, since it uses as much as digits as its factorization.

13221020323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888717196.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 13221020323 its reverse (32302012231), we get a palindrome (45523032554).

The spelling of 13221020323 in words is "thirteen billion, two hundred twenty-one million, twenty thousand, three hundred twenty-three".