210122100121 has 2 divisors, whose sum is σ = 210122100122. Its totient is φ = 210122100120.

The previous prime is 210122100103. The next prime is 210122100151. The reversal of 210122100121 is 121001221012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166623158025 + 43498942096 = 408195^2 + 208564^2 .

It is a cyclic number.

It is not a de Polignac number, because 210122100121 - 2⁹ = 210122099609 is a prime.

It is not a weakly prime, because it can be changed into another prime (210122100151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105061050060 + 105061050061.

It is an arithmetic number, because the mean of its divisors is an integer number (105061050061).

Almost surely, 2^210122100121 is an apocalyptic number.

It is an amenable number.

210122100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210122100121 is an equidigital number, since it uses as much as digits as its factorization.

210122100121 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 13.

Adding to 210122100121 its reverse (121001221012), we get a palindrome (331123321133).

The spelling of 210122100121 in words is "two hundred ten billion, one hundred twenty-two million, one hundred thousand, one hundred twenty-one".