208221 has 16 divisors (see below), whose sum is σ = 315840. Its totient is φ = 120960.

The previous prime is 208217. The next prime is 208223. The reversal of 208221 is 122802.

It is not a de Polignac number, because 208221 - 2² = 208217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 208221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208223) 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 15 ways as a sum of consecutive naturals, for example, 601 + ... + 881.

It is an arithmetic number, because the mean of its divisors is an integer number (19740).

2²⁰⁸²²¹ is an apocalyptic number.

It is an amenable number.

208221 is a deficient number, since it is larger than the sum of its proper divisors (107619).

208221 is a wasteful number, since it uses less digits than its factorization.

208221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 208221 is about 456.3123929941. The cubic root of 208221 is about 59.2708982877.

The spelling of 208221 in words is "two hundred eight thousand, two hundred twenty-one".