13011320321 has 4 divisors (see below), whose sum is σ = 13065309444. Its totient is φ = 12957331200.

The previous prime is 13011320291. The next prime is 13011320323. The reversal of 13011320321 is 12302311031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12302311031 = 1483 ⋅8295557.

It can be written as a sum of positive squares in 2 ways, for example, as 10547290000 + 2464030321 = 102700^2 + 49639^2 .

It is a cyclic number.

It is not a de Polignac number, because 13011320321 - 2¹⁰ = 13011319297 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 13011320321.

It is not an unprimeable number, because it can be changed into a prime (13011320323) 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, 26994200 + ... + 26994681.

It is an arithmetic number, because the mean of its divisors is an integer number (3266327361).

Almost surely, 2^13011320321 is an apocalyptic number.

It is an amenable number.

13011320321 is a deficient number, since it is larger than the sum of its proper divisors (53989123).

13011320321 is an equidigital number, since it uses as much as digits as its factorization.

13011320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53989122.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 13011320321 its reverse (12302311031), we get a palindrome (25313631352).

The spelling of 13011320321 in words is "thirteen billion, eleven million, three hundred twenty thousand, three hundred twenty-one".