4271221 has 2 divisors, whose sum is σ = 4271222. Its totient is φ = 4271220.

The previous prime is 4271213. The next prime is 4271227. The reversal of 4271221 is 1221724.

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., 2283121 + 1988100 = 1511^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 4271221 - 2³ = 4271213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4271227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2135610 + 2135611.

It is an arithmetic number, because the mean of its divisors is an integer number (2135611).

Almost surely, 2^4271221 is an apocalyptic number.

It is an amenable number.

4271221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4271221 is an equidigital number, since it uses as much as digits as its factorization.

4271221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 19.

The square root of 4271221 is about 2066.6932525172. The cubic root of 4271221 is about 162.2497418093.

Adding to 4271221 its reverse (1221724), we get a palindrome (5492945).

The spelling of 4271221 in words is "four million, two hundred seventy-one thousand, two hundred twenty-one".