210121000121 has 2 divisors, whose sum is σ = 210121000122. Its totient is φ = 210121000120.

The previous prime is 210120999989. The next prime is 210121000139. The reversal of 210121000121 is 121000121012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202680040000 + 7440960121 = 450200^2 + 86261^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121000121 - 2¹⁸ = 210120737977 is a prime.

It is not a weakly prime, because it can be changed into another prime (210121000151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060500060 + 105060500061.

It is an arithmetic number, because the mean of its divisors is an integer number (105060500061).

Almost surely, 2^210121000121 is an apocalyptic number.

It is an amenable number.

210121000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121000121 is an equidigital number, since it uses as much as digits as its factorization.

210121000121 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 210121000121 its reverse (121000121012), we get a palindrome (331121121133).

The spelling of 210121000121 in words is "two hundred ten billion, one hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.