4445553221 has 2 divisors, whose sum is σ = 4445553222. Its totient is φ = 4445553220.

The previous prime is 4445553209. The next prime is 4445553223. The reversal of 4445553221 is 1223555444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3538941121 + 906612100 = 59489^2 + 30110^2 .

It is a cyclic number.

It is not a de Polignac number, because 4445553221 - 2⁶ = 4445553157 is a prime.

Together with 4445553223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4445553223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2222776610 + 2222776611.

It is an arithmetic number, because the mean of its divisors is an integer number (2222776611).

Almost surely, 2^4445553221 is an apocalyptic number.

It is an amenable number.

4445553221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4445553221 is an equidigital number, since it uses as much as digits as its factorization.

4445553221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96000, while the sum is 35.

The square root of 4445553221 is about 66674.9819722510. The cubic root of 4445553221 is about 1644.2780954253.

The spelling of 4445553221 in words is "four billion, four hundred forty-five million, five hundred fifty-three thousand, two hundred twenty-one".