7328221 has 4 divisors (see below), whose sum is σ = 7344000. Its totient is φ = 7312444.

The previous prime is 7328201. The next prime is 7328231. The reversal of 7328221 is 1228237.

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.

It is a cyclic number.

It is not a de Polignac number, because 7328221 - 2⁹ = 7327709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7328201) 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, 7171 + ... + 8128.

It is an arithmetic number, because the mean of its divisors is an integer number (1836000).

Almost surely, 2^7328221 is an apocalyptic number.

It is an amenable number.

7328221 is a deficient number, since it is larger than the sum of its proper divisors (15779).

7328221 is a wasteful number, since it uses less digits than its factorization.

7328221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15778.

The product of its digits is 1344, while the sum is 25.

The square root of 7328221 is about 2707.0687098779. The cubic root of 7328221 is about 194.2373984682.

The spelling of 7328221 in words is "seven million, three hundred twenty-eight thousand, two hundred twenty-one".