7208221 has 8 divisors (see below), whose sum is σ = 7680960. Its totient is φ = 6740928.

The previous prime is 7208209. The next prime is 7208281. The reversal of 7208221 is 1228027.

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 7208221 - 2⁵ = 7208189 is a prime.

It is a Duffinian number.

7208221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7208192 and 7208201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7208281) 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, 1570 + ... + 4108.

It is an arithmetic number, because the mean of its divisors is an integer number (960120).

Almost surely, 2^7208221 is an apocalyptic number.

It is an amenable number.

7208221 is a deficient number, since it is larger than the sum of its proper divisors (472739).

7208221 is a wasteful number, since it uses less digits than its factorization.

7208221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 7208221 is about 2684.8130288718. The cubic root of 7208221 is about 193.1713423767.

The spelling of 7208221 in words is "seven million, two hundred eight thousand, two hundred twenty-one".