9721223 has 6 divisors (see below), whose sum is σ = 9965832. Its totient is φ = 9482480.

The previous prime is 9721199. The next prime is 9721241. The reversal of 9721223 is 3221279.

It is not a de Polignac number, because 9721223 - 2¹⁶ = 9655687 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9721192 and 9721201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1211 + ... + 4572.

It is an arithmetic number, because the mean of its divisors is an integer number (1660972).

Almost surely, 2^9721223 is an apocalyptic number.

9721223 is a deficient number, since it is larger than the sum of its proper divisors (244609).

9721223 is an equidigital number, since it uses as much as digits as its factorization.

9721223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5865 (or 5824 counting only the distinct ones).

The product of its digits is 1512, while the sum is 26.

The square root of 9721223 is about 3117.8875861711. The cubic root of 9721223 is about 213.4225486770.

The spelling of 9721223 in words is "nine million, seven hundred twenty-one thousand, two hundred twenty-three".