210101200121 has 2 divisors, whose sum is σ = 210101200122. Its totient is φ = 210101200120.

The previous prime is 210101200117. The next prime is 210101200123. The reversal of 210101200121 is 121002101012.

210101200121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192491910121 + 17609290000 = 438739^2 + 132700^2 .

It is a cyclic number.

It is not a de Polignac number, because 210101200121 - 2² = 210101200117 is a prime.

Together with 210101200123, 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 (210101200123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050600060 + 105050600061.

It is an arithmetic number, because the mean of its divisors is an integer number (105050600061).

Almost surely, 2^210101200121 is an apocalyptic number.

It is an amenable number.

210101200121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210101200121 is an equidigital number, since it uses as much as digits as its factorization.

210101200121 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 210101200121 its reverse (121002101012), we get a palindrome (331103301133).

The spelling of 210101200121 in words is "two hundred ten billion, one hundred one million, two hundred thousand, one hundred twenty-one".