8221117 has 4 divisors (see below), whose sum is σ = 8252640. Its totient is φ = 8189596.

The previous prime is 8221111. The next prime is 8221139. The reversal of 8221117 is 7111228.

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-8221117 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 (8221111) 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, 15367 + ... + 15892.

It is an arithmetic number, because the mean of its divisors is an integer number (2063160).

Almost surely, 2^8221117 is an apocalyptic number.

It is an amenable number.

8221117 is a deficient number, since it is larger than the sum of its proper divisors (31523).

8221117 is a wasteful number, since it uses less digits than its factorization.

8221117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31522.

The product of its digits is 224, while the sum is 22.

The square root of 8221117 is about 2867.2490299937. The cubic root of 8221117 is about 201.8259209992.

It can be divided in two parts, 82211 and 17, that added together give a palindrome (82228).

The spelling of 8221117 in words is "eight million, two hundred twenty-one thousand, one hundred seventeen".