4221445 has 4 divisors (see below), whose sum is σ = 5065740. Its totient is φ = 3377152.

The previous prime is 4221433. The next prime is 4221449. The reversal of 4221445 is 5441224.

It is a happy number.

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 2502724 + 1718721 = 1582^2 + 1311^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221445 - 2¹⁵ = 4188677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221449) 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, 422140 + ... + 422149.

It is an arithmetic number, because the mean of its divisors is an integer number (1266435).

Almost surely, 2^4221445 is an apocalyptic number.

It is an amenable number.

4221445 is a deficient number, since it is larger than the sum of its proper divisors (844295).

4221445 is an equidigital number, since it uses as much as digits as its factorization.

4221445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844294.

The product of its digits is 1280, while the sum is 22.

The square root of 4221445 is about 2054.6155358120. The cubic root of 4221445 is about 161.6170015483.

Adding to 4221445 its reverse (5441224), we get a palindrome (9662669).

The spelling of 4221445 in words is "four million, two hundred twenty-one thousand, four hundred forty-five".