2004221 has 4 divisors (see below), whose sum is σ = 2046912. Its totient is φ = 1961532.

The previous prime is 2004209. The next prime is 2004227. The reversal of 2004221 is 1224002.

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.

It is a cyclic number.

It is not a de Polignac number, because 2004221 - 2¹⁸ = 1742077 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2004227) 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, 21275 + ... + 21368.

It is an arithmetic number, because the mean of its divisors is an integer number (511728).

2^2004221 is an apocalyptic number.

It is an amenable number.

2004221 is a deficient number, since it is larger than the sum of its proper divisors (42691).

2004221 is an equidigital number, since it uses as much as digits as its factorization.

2004221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42690.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2004221 is about 1415.7051246640. The cubic root of 2004221 is about 126.0806781533.

Adding to 2004221 its reverse (1224002), we get a palindrome (3228223).

The spelling of 2004221 in words is "two million, four thousand, two hundred twenty-one".