4221220 has 12 divisors (see below), whose sum is σ = 8864604. Its totient is φ = 1688480.

The previous prime is 4221209. The next prime is 4221223. The reversal of 4221220 is 221224.

It can be written as a sum of positive squares in 2 ways, for example, as 1425636 + 2795584 = 1194^2 + 1672^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 4221220.

It is not an unprimeable number, because it can be changed into a prime (4221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105511 + ... + 105550.

It is an arithmetic number, because the mean of its divisors is an integer number (738717).

Almost surely, 2^4221220 is an apocalyptic number.

It is an amenable number.

4221220 is an abundant number, since it is smaller than the sum of its proper divisors (4643384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4221220 is a wasteful number, since it uses less digits than its factorization.

4221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211070 (or 211068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 4221220 is about 2054.5607803129. The cubic root of 4221220 is about 161.6141301404.

Adding to 4221220 its reverse (221224), we get a palindrome (4442444).

The spelling of 4221220 in words is "four million, two hundred twenty-one thousand, two hundred twenty".