208021 has 4 divisors (see below), whose sum is σ = 226944. Its totient is φ = 189100.

The previous prime is 208009. The next prime is 208037. The reversal of 208021 is 120802.

208021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 208021 - 2⁹ = 207509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 207992 and 208010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9445 + ... + 9466.

It is an arithmetic number, because the mean of its divisors is an integer number (56736).

2²⁰⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

208021 is a deficient number, since it is larger than the sum of its proper divisors (18923).

208021 is a wasteful number, since it uses less digits than its factorization.

208021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18922.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 208021 is about 456.0931922316. The cubic root of 208021 is about 59.2519152888.

Adding to 208021 its reverse (120802), we get a palindrome (328823).

The spelling of 208021 in words is "two hundred eight thousand, twenty-one".