13331003221 has 4 divisors (see below), whose sum is σ = 13331244172. Its totient is φ = 13330762272.

The previous prime is 13331003177. The next prime is 13331003227. The reversal of 13331003221 is 12230013331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12230013331 = 431 ⋅28375901.

It can be written as a sum of positive squares in 2 ways, for example, as 5531640625 + 7799362596 = 74375^2 + 88314^2 .

It is a cyclic number.

It is not a de Polignac number, because 13331003221 - 2⁷ = 13331003093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13331003227) 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, 8641 + ... + 163513.

It is an arithmetic number, because the mean of its divisors is an integer number (3332811043).

Almost surely, 2^13331003221 is an apocalyptic number.

It is an amenable number.

13331003221 is a deficient number, since it is larger than the sum of its proper divisors (240951).

13331003221 is an equidigital number, since it uses as much as digits as its factorization.

13331003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240950.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 13331003221 its reverse (12230013331), we get a palindrome (25561016552).

The spelling of 13331003221 in words is "thirteen billion, three hundred thirty-one million, three thousand, two hundred twenty-one".