13123203321 has 4 divisors (see below), whose sum is σ = 17497604432. Its totient is φ = 8748802212.

The previous prime is 13123203319. The next prime is 13123203389. The reversal of 13123203321 is 12330232131.

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 not a de Polignac number, because 13123203321 - 2¹ = 13123203319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13123203521) 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, 2187200551 + ... + 2187200556.

It is an arithmetic number, because the mean of its divisors is an integer number (4374401108).

Almost surely, 2^13123203321 is an apocalyptic number.

It is an amenable number.

13123203321 is a deficient number, since it is larger than the sum of its proper divisors (4374401111).

13123203321 is an equidigital number, since it uses as much as digits as its factorization.

13123203321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4374401110.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 13123203321 its reverse (12330232131), we get a palindrome (25453435452).

The spelling of 13123203321 in words is "thirteen billion, one hundred twenty-three million, two hundred three thousand, three hundred twenty-one".