2228221 has 2 divisors, whose sum is σ = 2228222. Its totient is φ = 2228220.

The previous prime is 2228209. The next prime is 2228243. The reversal of 2228221 is 1228222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1125721 + 1102500 = 1061^2 + 1050^2 .

It is a cyclic number.

It is not a de Polignac number, because 2228221 - 2⁵ = 2228189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2228201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1114110 + 1114111.

It is an arithmetic number, because the mean of its divisors is an integer number (1114111).

2^2228221 is an apocalyptic number.

It is an amenable number.

2228221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2228221 is an equidigital number, since it uses as much as digits as its factorization.

2228221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 19.

The square root of 2228221 is about 1492.7226802055. The cubic root of 2228221 is about 130.6129046438.

Subtracting from 2228221 its reverse (1228222), we obtain a palindrome (999999).

The spelling of 2228221 in words is "two million, two hundred twenty-eight thousand, two hundred twenty-one".