4442555221 has 12 divisors (see below), whose sum is σ = 4817976420. Its totient is φ = 4094513280.

The previous prime is 4442555203. The next prime is 4442555237. The reversal of 4442555221 is 1225552444.

It can be written as a sum of positive squares in 6 ways, for example, as 796086225 + 3646468996 = 28215^2 + 60386^2 .

It is not a de Polignac number, because 4442555221 - 2⁵ = 4442555189 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 (4442555251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91825 + ... + 131593.

It is an arithmetic number, because the mean of its divisors is an integer number (401498035).

Almost surely, 2^4442555221 is an apocalyptic number.

It is an amenable number.

4442555221 is a deficient number, since it is larger than the sum of its proper divisors (375421199).

4442555221 is a wasteful number, since it uses less digits than its factorization.

4442555221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40456 (or 40443 counting only the distinct ones).

The product of its digits is 64000, while the sum is 34.

The square root of 4442555221 is about 66652.4959847716. The cubic root of 4442555221 is about 1643.9083885870.

The spelling of 4442555221 in words is "four billion, four hundred forty-two million, five hundred fifty-five thousand, two hundred twenty-one".