7221065 has 4 divisors (see below), whose sum is σ = 8665284. Its totient is φ = 5776848.

The previous prime is 7221041. The next prime is 7221077. The reversal of 7221065 is 5601227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4609609 + 2611456 = 2147^2 + 1616^2 .

It is a cyclic number.

It is not a de Polignac number, because 7221065 - 2¹⁶ = 7155529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7221065.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722102 + ... + 722111.

It is an arithmetic number, because the mean of its divisors is an integer number (2166321).

Almost surely, 2^7221065 is an apocalyptic number.

It is an amenable number.

7221065 is a deficient number, since it is larger than the sum of its proper divisors (1444219).

7221065 is a wasteful number, since it uses less digits than its factorization.

7221065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444218.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 7221065 is about 2687.2039371808. The cubic root of 7221065 is about 193.2860086968.

The spelling of 7221065 in words is "seven million, two hundred twenty-one thousand, sixty-five".