13231201321 has 4 divisors (see below), whose sum is σ = 14248986052. Its totient is φ = 12213416592.

The previous prime is 13231201273. The next prime is 13231201327. The reversal of 13231201321 is 12310213231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12310213231 = 277 ⋅44441203.

It can be written as a sum of positive squares in 2 ways, for example, as 5838640921 + 7392560400 = 76411^2 + 85980^2 .

It is not a de Polignac number, because 13231201321 - 2⁹ = 13231200809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13231201327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508892346 + ... + 508892371.

It is an arithmetic number, because the mean of its divisors is an integer number (3562246513).

Almost surely, 2^13231201321 is an apocalyptic number.

It is an amenable number.

13231201321 is a deficient number, since it is larger than the sum of its proper divisors (1017784731).

13231201321 is a wasteful number, since it uses less digits than its factorization.

13231201321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017784730.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13231201321 its reverse (12310213231), we get a palindrome (25541414552).

The spelling of 13231201321 in words is "thirteen billion, two hundred thirty-one million, two hundred one thousand, three hundred twenty-one".