13143232321 has 8 divisors (see below), whose sum is σ = 13918680360. Its totient is φ = 12368041728.

The previous prime is 13143232307. The next prime is 13143232331. The reversal of 13143232321 is 12323234131.

It can be written as a sum of positive squares in 4 ways, for example, as 6576399025 + 6566833296 = 81095^2 + 81036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13143232321 - 2²³ = 13134843713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13143232331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46195 + ... + 168583.

It is an arithmetic number, because the mean of its divisors is an integer number (1739835045).

Almost surely, 2^13143232321 is an apocalyptic number.

It is an amenable number.

13143232321 is a deficient number, since it is larger than the sum of its proper divisors (775448039).

13143232321 is a wasteful number, since it uses less digits than its factorization.

13143232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128723.

The product of its digits is 2592, while the sum is 25.

Adding to 13143232321 its reverse (12323234131), we get a palindrome (25466466452).

The spelling of 13143232321 in words is "thirteen billion, one hundred forty-three million, two hundred thirty-two thousand, three hundred twenty-one".