8426221 has 2 divisors, whose sum is σ = 8426222. Its totient is φ = 8426220.

The previous prime is 8426189. The next prime is 8426227. The reversal of 8426221 is 1226248.

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., 7128900 + 1297321 = 2670^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 8426221 - 2⁵ = 8426189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8426227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4213110 + 4213111.

It is an arithmetic number, because the mean of its divisors is an integer number (4213111).

Almost surely, 2^8426221 is an apocalyptic number.

It is an amenable number.

8426221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8426221 is an equidigital number, since it uses as much as digits as its factorization.

8426221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 25.

The square root of 8426221 is about 2902.7953768738. The cubic root of 8426221 is about 203.4905669673.

The spelling of 8426221 in words is "eight million, four hundred twenty-six thousand, two hundred twenty-one".