210121010201 has 2 divisors, whose sum is σ = 210121010202. Its totient is φ = 210121010200.

The previous prime is 210121010189. The next prime is 210121010243. The reversal of 210121010201 is 102010121012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141135462400 + 68985547801 = 375680^2 + 262651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210121010201 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (210120010201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060505100 + 105060505101.

It is an arithmetic number, because the mean of its divisors is an integer number (105060505101).

Almost surely, 2^210121010201 is an apocalyptic number.

It is an amenable number.

210121010201 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121010201 is an equidigital number, since it uses as much as digits as its factorization.

210121010201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210121010201 its reverse (102010121012), we get a palindrome (312131131213).

The spelling of 210121010201 in words is "two hundred ten billion, one hundred twenty-one million, ten thousand, two hundred one".