9812221 has 4 divisors (see below), whose sum is σ = 9904032. Its totient is φ = 9720412.

The previous prime is 9812207. The next prime is 9812233. The reversal of 9812221 is 1222189.

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 9812221 - 2⁹ = 9811709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9812321) 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, 45745 + ... + 45958.

It is an arithmetic number, because the mean of its divisors is an integer number (2476008).

Almost surely, 2^9812221 is an apocalyptic number.

It is an amenable number.

9812221 is a deficient number, since it is larger than the sum of its proper divisors (91811).

9812221 is a wasteful number, since it uses less digits than its factorization.

9812221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91810.

The product of its digits is 576, while the sum is 25.

The square root of 9812221 is about 3132.4464879707. The cubic root of 9812221 is about 214.0864136994.

The spelling of 9812221 in words is "nine million, eight hundred twelve thousand, two hundred twenty-one".