8117221 has 8 divisors (see below), whose sum is σ = 9503424. Its totient is φ = 6787680.

The previous prime is 8117203. The next prime is 8117243. The reversal of 8117221 is 1227118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8117221 - 2⁵ = 8117189 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8117192 and 8117201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8117201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13855 + ... + 14428.

It is an arithmetic number, because the mean of its divisors is an integer number (1187928).

Almost surely, 2^8117221 is an apocalyptic number.

It is an amenable number.

8117221 is a deficient number, since it is larger than the sum of its proper divisors (1386203).

8117221 is a wasteful number, since it uses less digits than its factorization.

8117221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28331.

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

The square root of 8117221 is about 2849.0737091202. The cubic root of 8117221 is about 200.9721090315.

It can be divided in two parts, 8117 and 221, that added together give a palindrome (8338).

The spelling of 8117221 in words is "eight million, one hundred seventeen thousand, two hundred twenty-one".