7205221 has 4 divisors (see below), whose sum is σ = 7210944. Its totient is φ = 7199500.

The previous prime is 7205213. The next prime is 7205243. The reversal of 7205221 is 1225027.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7205221 - 2³ = 7205213 is a prime.

It is a Duffinian number.

7205221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7205321) 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, 55 + ... + 3796.

It is an arithmetic number, because the mean of its divisors is an integer number (1802736).

Almost surely, 2^7205221 is an apocalyptic number.

It is an amenable number.

7205221 is a deficient number, since it is larger than the sum of its proper divisors (5723).

7205221 is a wasteful number, since it uses less digits than its factorization.

7205221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 7205221 is about 2684.2542726053. The cubic root of 7205221 is about 193.1445399039.

The spelling of 7205221 in words is "seven million, two hundred five thousand, two hundred twenty-one".