4228221 has 4 divisors (see below), whose sum is σ = 5637632. Its totient is φ = 2818812.

The previous prime is 4228199. The next prime is 4228243. The reversal of 4228221 is 1228224.

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 an interprime number because it is at equal distance from previous prime (4228199) and next prime (4228243).

It is not a de Polignac number, because 4228221 - 2⁶ = 4228157 is a prime.

It is a D-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 (4228271) 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, 704701 + ... + 704706.

It is an arithmetic number, because the mean of its divisors is an integer number (1409408).

Almost surely, 2^4228221 is an apocalyptic number.

It is an amenable number.

4228221 is a deficient number, since it is larger than the sum of its proper divisors (1409411).

4228221 is a wasteful number, since it uses less digits than its factorization.

4228221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409410.

The product of its digits is 512, while the sum is 21.

The square root of 4228221 is about 2056.2638449382. The cubic root of 4228221 is about 161.7034278302.

The spelling of 4228221 in words is "four million, two hundred twenty-eight thousand, two hundred twenty-one".