8118221 has 8 divisors (see below), whose sum is σ = 8279040. Its totient is φ = 7959168.

The previous prime is 8118217. The next prime is 8118233. The reversal of 8118221 is 1228118.

It is a happy number.

8118221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8118221 - 2² = 8118217 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8118251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11990 + ... + 12648.

It is an arithmetic number, because the mean of its divisors is an integer number (1034880).

Almost surely, 2^8118221 is an apocalyptic number.

It is an amenable number.

8118221 is a deficient number, since it is larger than the sum of its proper divisors (160819).

8118221 is a wasteful number, since it uses less digits than its factorization.

8118221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883.

The product of its digits is 256, while the sum is 23.

The square root of 8118221 is about 2849.2491993506. The cubic root of 8118221 is about 200.9803616037.

The spelling of 8118221 in words is "eight million, one hundred eighteen thousand, two hundred twenty-one".