8422221 has 4 divisors (see below), whose sum is σ = 11229632. Its totient is φ = 5614812.

The previous prime is 8422217. The next prime is 8422223. The reversal of 8422221 is 1222248.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8422221 - 2² = 8422217 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8422223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1403701 + ... + 1403706.

It is an arithmetic number, because the mean of its divisors is an integer number (2807408).

Almost surely, 2^8422221 is an apocalyptic number.

It is an amenable number.

8422221 is a deficient number, since it is larger than the sum of its proper divisors (2807411).

8422221 is a wasteful number, since it uses less digits than its factorization.

8422221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807410.

The product of its digits is 512, while the sum is 21.

The square root of 8422221 is about 2902.1063040488. The cubic root of 8422221 is about 203.4583622934.

Adding to 8422221 its reverse (1222248), we get a palindrome (9644469).

The spelling of 8422221 in words is "eight million, four hundred twenty-two thousand, two hundred twenty-one".