208121 has 2 divisors, whose sum is σ = 208122. Its totient is φ = 208120.

The previous prime is 208111. The next prime is 208129. The reversal of 208121 is 121802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132496 + 75625 = 364^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 208121 - 2⁶ = 208057 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is a zygodrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 208096 and 208105.

It is not a weakly prime, because it can be changed into another prime (208129) 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 as a sum of consecutive naturals, namely, 104060 + 104061.

It is an arithmetic number, because the mean of its divisors is an integer number (104061).

2²⁰⁸¹²¹ is an apocalyptic number.

It is an amenable number.

208121 is a deficient number, since it is larger than the sum of its proper divisors (1).

208121 is an equidigital number, since it uses as much as digits as its factorization.

208121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 208121 is about 456.2028057783. The cubic root of 208121 is about 59.2614083084.

Adding to 208121 its reverse (121802), we get a palindrome (329923).

The spelling of 208121 in words is "two hundred eight thousand, one hundred twenty-one".