7333221 has 16 divisors (see below), whose sum is σ = 11763200. Its totient is φ = 3969648.

The previous prime is 7333211. The next prime is 7333231. The reversal of 7333221 is 1223337.

It is an interprime number because it is at equal distance from previous prime (7333211) and next prime (7333231).

It is not a de Polignac number, because 7333221 - 2⁵ = 7333189 is a prime.

It is a super-2 number, since 2×7333221² = 107552260469682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7333211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8791 + ... + 9588.

It is an arithmetic number, because the mean of its divisors is an integer number (735200).

Almost surely, 2^7333221 is an apocalyptic number.

It is an amenable number.

7333221 is a deficient number, since it is larger than the sum of its proper divisors (4429979).

7333221 is a wasteful number, since it uses less digits than its factorization.

7333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18408.

The product of its digits is 756, while the sum is 21.

The square root of 7333221 is about 2707.9920605497. The cubic root of 7333221 is about 194.2815640848.

Adding to 7333221 its reverse (1223337), we get a palindrome (8556558).

The spelling of 7333221 in words is "seven million, three hundred thirty-three thousand, two hundred twenty-one".