4455221 has 2 divisors, whose sum is σ = 4455222. Its totient is φ = 4455220.

The previous prime is 4455203. The next prime is 4455223. The reversal of 4455221 is 1225544.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2686321 + 1768900 = 1639^2 + 1330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4455221 is a prime.

It is a Sophie Germain prime.

Together with 4455223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4455223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2227610 + 2227611.

It is an arithmetic number, because the mean of its divisors is an integer number (2227611).

Almost surely, 2^4455221 is an apocalyptic number.

It is an amenable number.

4455221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4455221 is an equidigital number, since it uses as much as digits as its factorization.

4455221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1600, while the sum is 23.

The square root of 4455221 is about 2110.7394438916. The cubic root of 4455221 is about 164.5469173860.

The spelling of 4455221 in words is "four million, four hundred fifty-five thousand, two hundred twenty-one".