13131232321 has 8 divisors (see below), whose sum is σ = 13220349480. Its totient is φ = 13042267392.

The previous prime is 13131232249. The next prime is 13131232333. The reversal of 13131232321 is 12323213131.

It can be written as a sum of positive squares in 4 ways, for example, as 3965850625 + 9165381696 = 62975^2 + 95736^2 .

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 13131232321 - 2¹⁵ = 13131199553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13131232292 and 13131232301.

It is not an unprimeable number, because it can be changed into a prime (13131232721) 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, 137785 + ... + 212713.

It is an arithmetic number, because the mean of its divisors is an integer number (1652543685).

Almost surely, 2^13131232321 is an apocalyptic number.

It is an amenable number.

13131232321 is a deficient number, since it is larger than the sum of its proper divisors (89117159).

13131232321 is a wasteful number, since it uses less digits than its factorization.

13131232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76115.

The product of its digits is 648, while the sum is 22.

Adding to 13131232321 its reverse (12323213131), we get a palindrome (25454445452).

The spelling of 13131232321 in words is "thirteen billion, one hundred thirty-one million, two hundred thirty-two thousand, three hundred twenty-one".