4444444221 has 16 divisors (see below), whose sum is σ = 6916583424. Its totient is φ = 2485646064.

The previous prime is 4444444211. The next prime is 4444444229. The reversal of 4444444221 is 1224444444.

It is not a de Polignac number, because 4444444221 - 2¹¹ = 4444442173 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4444444229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2250505 + ... + 2252478.

It is an arithmetic number, because the mean of its divisors is an integer number (432286464).

Almost surely, 2^4444444221 is an apocalyptic number.

It is an amenable number.

4444444221 is a deficient number, since it is larger than the sum of its proper divisors (2472139203).

4444444221 is a wasteful number, since it uses less digits than its factorization.

4444444221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4503040.

The product of its digits is 65536, while the sum is 33.

The square root of 4444444221 is about 66666.6649908333. The cubic root of 4444444221 is about 1644.1413553339.

Adding to 4444444221 its reverse (1224444444), we get a palindrome (5668888665).

The spelling of 4444444221 in words is "four billion, four hundred forty-four million, four hundred forty-four thousand, two hundred twenty-one".