210204121 has 2 divisors, whose sum is σ = 210204122. Its totient is φ = 210204120.

The previous prime is 210204119. The next prime is 210204143. The reversal of 210204121 is 121402012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126225225 + 83978896 = 11235^2 + 9164^2 .

It is a cyclic number.

It is not a de Polignac number, because 210204121 - 2¹ = 210204119 is a prime.

Together with 210204119, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (210204161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105102060 + 105102061.

It is an arithmetic number, because the mean of its divisors is an integer number (105102061).

Almost surely, 2^210204121 is an apocalyptic number.

It is an amenable number.

210204121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210204121 is an equidigital number, since it uses as much as digits as its factorization.

210204121 is an evil number, because the sum of its binary digits is even.

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

The square root of 210204121 is about 14498.4178792032. The cubic root of 210204121 is about 594.5847169272.

Adding to 210204121 its reverse (121402012), we get a palindrome (331606133).

The spelling of 210204121 in words is "two hundred ten million, two hundred four thousand, one hundred twenty-one".