4224221 has 4 divisors (see below), whose sum is σ = 4248000. Its totient is φ = 4200444.

The previous prime is 4224197. The next prime is 4224229. The reversal of 4224221 is 1224224.

It is a happy number.

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 4224221 - 2¹⁴ = 4207837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4224221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4224229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11621 + ... + 11978.

It is an arithmetic number, because the mean of its divisors is an integer number (1062000).

Almost surely, 2^4224221 is an apocalyptic number.

It is an amenable number.

4224221 is a deficient number, since it is larger than the sum of its proper divisors (23779).

4224221 is a wasteful number, since it uses less digits than its factorization.

4224221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23778.

The product of its digits is 256, while the sum is 17.

The square root of 4224221 is about 2055.2909769665. The cubic root of 4224221 is about 161.6524199488.

Adding to 4224221 its reverse (1224224), we get a palindrome (5448445).

The spelling of 4224221 in words is "four million, two hundred twenty-four thousand, two hundred twenty-one".