7331221 has 8 divisors (see below), whose sum is σ = 7617024. Its totient is φ = 7048560.

The previous prime is 7331213. The next prime is 7331237. The reversal of 7331221 is 1221337.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7331221 - 2³ = 7331213 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 (7331021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4680 + ... + 6046.

It is an arithmetic number, because the mean of its divisors is an integer number (952128).

Almost surely, 2^7331221 is an apocalyptic number.

It is an amenable number.

7331221 is a deficient number, since it is larger than the sum of its proper divisors (285803).

7331221 is a wasteful number, since it uses less digits than its factorization.

7331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its digits is 252, while the sum is 19.

The square root of 7331221 is about 2707.6227580666. The cubic root of 7331221 is about 194.2639002480.

Adding to 7331221 its reverse (1221337), we get a palindrome (8552558).

The spelling of 7331221 in words is "seven million, three hundred thirty-one thousand, two hundred twenty-one".