7221165 has 32 divisors (see below), whose sum is σ = 13359360. Its totient is φ = 3262464.

The previous prime is 7221163. The next prime is 7221169. The reversal of 7221165 is 5611227.

It is not a de Polignac number, because 7221165 - 2¹ = 7221163 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 (7221161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9831 + ... + 10539.

It is an arithmetic number, because the mean of its divisors is an integer number (417480).

Almost surely, 2^7221165 is an apocalyptic number.

It is an amenable number.

7221165 is a deficient number, since it is larger than the sum of its proper divisors (6138195).

7221165 is a wasteful number, since it uses less digits than its factorization.

7221165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821.

The product of its digits is 840, while the sum is 24.

The square root of 7221165 is about 2687.2225438173. Note that the first 3 decimals coincide. The cubic root of 7221165 is about 193.2869009249.

The spelling of 7221165 in words is "seven million, two hundred twenty-one thousand, one hundred sixty-five".