8222021 has 4 divisors (see below), whose sum is σ = 8239392. Its totient is φ = 8204652.

The previous prime is 8222009. The next prime is 8222047. The reversal of 8222021 is 1202228.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8222021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8222821) 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, 7955 + ... + 8928.

It is an arithmetic number, because the mean of its divisors is an integer number (2059848).

Almost surely, 2^8222021 is an apocalyptic number.

It is an amenable number.

8222021 is a deficient number, since it is larger than the sum of its proper divisors (17371).

8222021 is a wasteful number, since it uses less digits than its factorization.

8222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17370.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 8222021 is about 2867.4066680539. The cubic root of 8222021 is about 201.8333183697.

Adding to 8222021 its reverse (1202228), we get a palindrome (9424249).

The spelling of 8222021 in words is "eight million, two hundred twenty-two thousand, twenty-one".