4420221 has 32 divisors (see below), whose sum is σ = 6894720. Its totient is φ = 2494464.

The previous prime is 4420219. The next prime is 4420231. The reversal of 4420221 is 1220244.

It is not a de Polignac number, because 4420221 - 2¹ = 4420219 is a prime.

It is an Ulam 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 4420221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4420231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39061 + ... + 39173.

It is an arithmetic number, because the mean of its divisors is an integer number (215460).

Almost surely, 2^4420221 is an apocalyptic number.

It is an amenable number.

4420221 is a deficient number, since it is larger than the sum of its proper divisors (2474499).

4420221 is a wasteful number, since it uses less digits than its factorization.

4420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205.

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

The square root of 4420221 is about 2102.4321629960. The cubic root of 4420221 is about 164.1148932166.

Adding to 4420221 its reverse (1220244), we get a palindrome (5640465).

The spelling of 4420221 in words is "four million, four hundred twenty thousand, two hundred twenty-one".