8702221 has 4 divisors (see below), whose sum is σ = 9493344. Its totient is φ = 7911100.

The previous prime is 8702207. The next prime is 8702231. The reversal of 8702221 is 1222078.

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 not a de Polignac number, because 8702221 - 2⁵ = 8702189 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8702192 and 8702201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8702231) 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, 395545 + ... + 395566.

It is an arithmetic number, because the mean of its divisors is an integer number (2373336).

Almost surely, 2^8702221 is an apocalyptic number.

It is an amenable number.

8702221 is a deficient number, since it is larger than the sum of its proper divisors (791123).

8702221 is a wasteful number, since it uses less digits than its factorization.

8702221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791122.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 8702221 is about 2949.9527114854. The cubic root of 8702221 is about 205.6885118678.

Adding to 8702221 its reverse (1222078), we get a palindrome (9924299).

The spelling of 8702221 in words is "eight million, seven hundred two thousand, two hundred twenty-one".