8550221 has 8 divisors (see below), whose sum is σ = 8741760. Its totient is φ = 8360352.

The previous prime is 8550211. The next prime is 8550229. The reversal of 8550221 is 1220558.

8550221 is digitally balanced in base 2 and base 3, because in such bases 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 a de Polignac number, because none of the positive numbers 2^k-8550221 is a prime.

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 (8550229) 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, 18236 + ... + 18698.

It is an arithmetic number, because the mean of its divisors is an integer number (1092720).

Almost surely, 2^8550221 is an apocalyptic number.

It is an amenable number.

8550221 is a deficient number, since it is larger than the sum of its proper divisors (191539).

8550221 is a wasteful number, since it uses less digits than its factorization.

8550221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 8550221 is about 2924.0760934011. The cubic root of 8550221 is about 204.4838970827.

Adding to 8550221 its reverse (1220558), we get a palindrome (9770779).

The spelling of 8550221 in words is "eight million, five hundred fifty thousand, two hundred twenty-one".