7216321 has 12 divisors (see below), whose sum is σ = 8428672. Its totient is φ = 6052176.

The previous prime is 7216309. The next prime is 7216343. The reversal of 7216321 is 1236127.

It is not a de Polignac number, because 7216321 - 2⁷ = 7216193 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 7216292 and 7216301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7216301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19480 + ... + 19846.

Almost surely, 2^7216321 is an apocalyptic number.

It is an amenable number.

7216321 is a deficient number, since it is larger than the sum of its proper divisors (1212351).

7216321 is an equidigital number, since it uses as much as digits as its factorization.

7216321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 427 counting only the distinct ones).

The product of its digits is 504, while the sum is 22.

The square root of 7216321 is about 2686.3210902645. The cubic root of 7216321 is about 193.2436719270.

The spelling of 7216321 in words is "seven million, two hundred sixteen thousand, three hundred twenty-one".