208804021 has 8 divisors (see below), whose sum is σ = 214097688. Its totient is φ = 203520000.

The previous prime is 208804007. The next prime is 208804039. The reversal of 208804021 is 120408802.

It can be written as a sum of positive squares in 4 ways, for example, as 10304100 + 198499921 = 3210^2 + 14089^2 .

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 208804021 - 2⁵ = 208803989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208804621) 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, 64051 + ... + 67231.

It is an arithmetic number, because the mean of its divisors is an integer number (26762211).

Almost surely, 2^208804021 is an apocalyptic number.

It is an amenable number.

208804021 is a deficient number, since it is larger than the sum of its proper divisors (5293667).

208804021 is a wasteful number, since it uses less digits than its factorization.

208804021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4823.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 208804021 is about 14450.0526296619. The cubic root of 208804021 is about 593.2616644978.

The spelling of 208804021 in words is "two hundred eight million, eight hundred four thousand, twenty-one".