8710221 has 8 divisors (see below), whose sum is σ = 12507040. Its totient is φ = 5360112.

The previous prime is 8710213. The next prime is 8710241. The reversal of 8710221 is 1220178.

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

It is not a de Polignac number, because 8710221 - 2³ = 8710213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8710241) 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, 111631 + ... + 111708.

It is an arithmetic number, because the mean of its divisors is an integer number (1563380).

Almost surely, 2^8710221 is an apocalyptic number.

It is an amenable number.

8710221 is a deficient number, since it is larger than the sum of its proper divisors (3796819).

8710221 is a wasteful number, since it uses less digits than its factorization.

8710221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223355.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 8710221 is about 2951.3083539339. The cubic root of 8710221 is about 205.7515227593.

Adding to 8710221 its reverse (1220178), we get a palindrome (9930399).

The spelling of 8710221 in words is "eight million, seven hundred ten thousand, two hundred twenty-one".