7224321 has 16 divisors (see below), whose sum is σ = 10523520. Its totient is φ = 4381440.

The previous prime is 7224311. The next prime is 7224341. The reversal of 7224321 is 1234227.

It is not a de Polignac number, because 7224321 - 2⁵ = 7224289 is a prime.

It is a super-2 number, since 2×7224321² = 104381627822082, which contains 22 as substring.

7224321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7224311) 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, 1465 + ... + 4073.

It is an arithmetic number, because the mean of its divisors is an integer number (657720).

Almost surely, 2^7224321 is an apocalyptic number.

7224321 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

7224321 is a deficient number, since it is larger than the sum of its proper divisors (3299199).

7224321 is a wasteful number, since it uses less digits than its factorization.

7224321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696.

The product of its digits is 672, while the sum is 21.

The square root of 7224321 is about 2687.8097030854. The cubic root of 7224321 is about 193.3150554130.

Adding to 7224321 its reverse (1234227), we get a palindrome (8458548).

The spelling of 7224321 in words is "seven million, two hundred twenty-four thousand, three hundred twenty-one".