210004121 has 2 divisors, whose sum is σ = 210004122. Its totient is φ = 210004120.

The previous prime is 210004117. The next prime is 210004129. The reversal of 210004121 is 121400012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209120521 + 883600 = 14461^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 210004121 - 2² = 210004117 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (210004129) 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, 105002060 + 105002061.

It is an arithmetic number, because the mean of its divisors is an integer number (105002061).

Almost surely, 2^210004121 is an apocalyptic number.

It is an amenable number.

210004121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210004121 is an equidigital number, since it uses as much as digits as its factorization.

210004121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 210004121 is about 14491.5189335004. The cubic root of 210004121 is about 594.3960833306.

Adding to 210004121 its reverse (121400012), we get a palindrome (331404133).

The spelling of 210004121 in words is "two hundred ten million, four thousand, one hundred twenty-one".