13004221 has 4 divisors (see below), whose sum is σ = 13423744. Its totient is φ = 12584700.

The previous prime is 13004207. The next prime is 13004261. The reversal of 13004221 is 12240031.

13004221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12240031 = 937 ⋅13063.

It is a cyclic number.

It is not a de Polignac number, because 13004221 - 2¹¹ = 13002173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13004261) 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, 209715 + ... + 209776.

It is an arithmetic number, because the mean of its divisors is an integer number (3355936).

Almost surely, 2^13004221 is an apocalyptic number.

It is an amenable number.

13004221 is a deficient number, since it is larger than the sum of its proper divisors (419523).

13004221 is an equidigital number, since it uses as much as digits as its factorization.

13004221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419522.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 13004221 is about 3606.1365753393. The cubic root of 13004221 is about 235.1589146944.

Adding to 13004221 its reverse (12240031), we get a palindrome (25244252).

It can be divided in two parts, 13004 and 221, that added together give a square (13225 = 115²).

The spelling of 13004221 in words is "thirteen million, four thousand, two hundred twenty-one".