7216221 has 8 divisors (see below), whose sum is σ = 9881824. Its totient is φ = 4680720.

The previous prime is 7216213. The next prime is 7216241. The reversal of 7216221 is 1226127.

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

It is not a de Polignac number, because 7216221 - 2³ = 7216213 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7216241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32395 + ... + 32616.

It is an arithmetic number, because the mean of its divisors is an integer number (1235228).

Almost surely, 2^7216221 is an apocalyptic number.

It is an amenable number.

7216221 is a deficient number, since it is larger than the sum of its proper divisors (2665603).

7216221 is a wasteful number, since it uses less digits than its factorization.

7216221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65051.

The product of its digits is 336, while the sum is 21.

The square root of 7216221 is about 2686.3024773841. The cubic root of 7216221 is about 193.2427792996.

The spelling of 7216221 in words is "seven million, two hundred sixteen thousand, two hundred twenty-one".