4418221 has 2 divisors, whose sum is σ = 4418222. Its totient is φ = 4418220.

The previous prime is 4418209. The next prime is 4418243. The reversal of 4418221 is 1228144.

It is an a-pointer prime, because the next prime (4418243) can be obtained adding 4418221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4182025 + 236196 = 2045^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 4418221 - 2⁵ = 4418189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4418192 and 4418201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4418261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2209110 + 2209111.

It is an arithmetic number, because the mean of its divisors is an integer number (2209111).

Almost surely, 2^4418221 is an apocalyptic number.

It is an amenable number.

4418221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4418221 is an equidigital number, since it uses as much as digits as its factorization.

4418221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 22.

The square root of 4418221 is about 2101.9564695778. The cubic root of 4418221 is about 164.0901373425.

The spelling of 4418221 in words is "four million, four hundred eighteen thousand, two hundred twenty-one".