9865221 has 8 divisors (see below), whose sum is σ = 13169664. Its totient is φ = 6568800.

The previous prime is 9865211. The next prime is 9865241. The reversal of 9865221 is 1225689.

9865221 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 not a de Polignac number, because 9865221 - 2²¹ = 7768069 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9865201) 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, 2025 + ... + 4881.

It is an arithmetic number, because the mean of its divisors is an integer number (1646208).

Almost surely, 2^9865221 is an apocalyptic number.

It is an amenable number.

9865221 is a deficient number, since it is larger than the sum of its proper divisors (3304443).

9865221 is a wasteful number, since it uses less digits than its factorization.

9865221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011.

The product of its digits is 8640, while the sum is 33.

The square root of 9865221 is about 3140.8949361607. The cubic root of 9865221 is about 214.4711791793.

The spelling of 9865221 in words is "nine million, eight hundred sixty-five thousand, two hundred twenty-one".