13144321 has 4 divisors (see below), whose sum is σ = 13292100. Its totient is φ = 12996544.

The previous prime is 13144319. The next prime is 13144331. The reversal of 13144321 is 12344131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12344131 = 71 ⋅173861.

It can be written as a sum of positive squares in 2 ways, for example, as 929296 + 12215025 = 964^2 + 3495^2 .

It is a cyclic number.

It is not a de Polignac number, because 13144321 - 2¹ = 13144319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13144331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73756 + ... + 73933.

It is an arithmetic number, because the mean of its divisors is an integer number (3323025).

Almost surely, 2^13144321 is an apocalyptic number.

It is an amenable number.

13144321 is a deficient number, since it is larger than the sum of its proper divisors (147779).

13144321 is an equidigital number, since it uses as much as digits as its factorization.

13144321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147778.

The product of its digits is 288, while the sum is 19.

The square root of 13144321 is about 3625.5097572617. The cubic root of 13144321 is about 236.0003890159. Note that the first 3 decimals are identical.

Adding to 13144321 its reverse (12344131), we get a palindrome (25488452).

The spelling of 13144321 in words is "thirteen million, one hundred forty-four thousand, three hundred twenty-one".