7221585 has 16 divisors (see below), whose sum is σ = 13205376. Its totient is φ = 3301248.

The previous prime is 7221569. The next prime is 7221587. The reversal of 7221585 is 5851227.

It is not a de Polignac number, because 7221585 - 2⁴ = 7221569 is a prime.

7221585 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221587) 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 15 ways as a sum of consecutive naturals, for example, 34284 + ... + 34493.

It is an arithmetic number, because the mean of its divisors is an integer number (825336).

Almost surely, 2^7221585 is an apocalyptic number.

It is an amenable number.

7221585 is a deficient number, since it is larger than the sum of its proper divisors (5983791).

7221585 is a wasteful number, since it uses less digits than its factorization.

7221585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68792.

The product of its digits is 5600, while the sum is 30.

The square root of 7221585 is about 2687.3006902838. The cubic root of 7221585 is about 193.2906481930.

The spelling of 7221585 in words is "seven million, two hundred twenty-one thousand, five hundred eighty-five".