2404221 has 4 divisors (see below), whose sum is σ = 3205632. Its totient is φ = 1602812.

The previous prime is 2404211. The next prime is 2404229. The reversal of 2404221 is 1224042.

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 2404221 - 2⁷ = 2404093 is a prime.

It is a D-number.

2404221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2404221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2404229) 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, 400701 + ... + 400706.

It is an arithmetic number, because the mean of its divisors is an integer number (801408).

2^2404221 is an apocalyptic number.

It is an amenable number.

2404221 is a deficient number, since it is larger than the sum of its proper divisors (801411).

2404221 is an equidigital number, since it uses as much as digits as its factorization.

2404221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801410.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 2404221 is about 1550.5550619053. Note that the first 3 decimals coincide. The cubic root of 2404221 is about 133.9650350594.

Adding to 2404221 its reverse (1224042), we get a palindrome (3628263).

The spelling of 2404221 in words is "two million, four hundred four thousand, two hundred twenty-one".