4431221 has 4 divisors (see below), whose sum is σ = 4481100. Its totient is φ = 4381344.

The previous prime is 4431187. The next prime is 4431227. The reversal of 4431221 is 1221344.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 874225 + 3556996 = 935^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 4431221 - 2²² = 236917 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 4431221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4431227) 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 3 ways as a sum of consecutive naturals, for example, 24806 + ... + 24983.

It is an arithmetic number, because the mean of its divisors is an integer number (1120275).

Almost surely, 2^4431221 is an apocalyptic number.

It is an amenable number.

4431221 is a deficient number, since it is larger than the sum of its proper divisors (49879).

4431221 is an equidigital number, since it uses as much as digits as its factorization.

4431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49878.

The product of its digits is 192, while the sum is 17.

The square root of 4431221 is about 2105.0465553047. The cubic root of 4431221 is about 164.2509172139.

Adding to 4431221 its reverse (1221344), we get a palindrome (5652565).

The spelling of 4431221 in words is "four million, four hundred thirty-one thousand, two hundred twenty-one".