2271221 has 2 divisors, whose sum is σ = 2271222. Its totient is φ = 2271220.

The previous prime is 2271163. The next prime is 2271223. The reversal of 2271221 is 1221722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 1030225 = 1114^2 + 1015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2271221 is a prime.

Together with 2271223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2271221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2271223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1135610 + 1135611.

It is an arithmetic number, because the mean of its divisors is an integer number (1135611).

2^2271221 is an apocalyptic number.

It is an amenable number.

2271221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2271221 is an equidigital number, since it uses as much as digits as its factorization.

2271221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112, while the sum is 17.

The square root of 2271221 is about 1507.0570659401. The cubic root of 2271221 is about 131.4477424438.

Adding to 2271221 its reverse (1221722), we get a palindrome (3492943).

The spelling of 2271221 in words is "two million, two hundred seventy-one thousand, two hundred twenty-one".