4444013221 has 4 divisors (see below), whose sum is σ = 4445122444. Its totient is φ = 4442904000.

The previous prime is 4444013219. The next prime is 4444013251. The reversal of 4444013221 is 1223104444.

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 333792900 + 4110220321 = 18270^2 + 64111^2 .

It is a cyclic number.

It is not a de Polignac number, because 4444013221 - 2¹ = 4444013219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4444013251) 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, 548580 + ... + 556621.

It is an arithmetic number, because the mean of its divisors is an integer number (1111280611).

Almost surely, 2^4444013221 is an apocalyptic number.

It is an amenable number.

4444013221 is a deficient number, since it is larger than the sum of its proper divisors (1109223).

4444013221 is a wasteful number, since it uses less digits than its factorization.

4444013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109222.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 4444013221 is about 66663.4324123803. The cubic root of 4444013221 is about 1644.0882067439.

Adding to 4444013221 its reverse (1223104444), we get a palindrome (5667117665).

The spelling of 4444013221 in words is "four billion, four hundred forty-four million, thirteen thousand, two hundred twenty-one".