4206221 has 2 divisors, whose sum is σ = 4206222. Its totient is φ = 4206220.

The previous prime is 4206203. The next prime is 4206227. The reversal of 4206221 is 1226024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4202500 + 3721 = 2050^2 + 61^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4206221 is a prime.

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 4206221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4206227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2103110 + 2103111.

It is an arithmetic number, because the mean of its divisors is an integer number (2103111).

Almost surely, 2^4206221 is an apocalyptic number.

It is an amenable number.

4206221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4206221 is an equidigital number, since it uses as much as digits as its factorization.

4206221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 4206221 is about 2050.9073601701. The cubic root of 4206221 is about 161.4224851425.

The spelling of 4206221 in words is "four million, two hundred six thousand, two hundred twenty-one".