210120210121 has 2 divisors, whose sum is σ = 210120210122. Its totient is φ = 210120210120.

The previous prime is 210120210073. The next prime is 210120210127. The reversal of 210120210121 is 121012021012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110513694096 + 99606516025 = 332436^2 + 315605^2 .

It is a cyclic number.

It is not a de Polignac number, because 210120210121 - 2¹⁷ = 210120079049 is a prime.

It is not a weakly prime, because it can be changed into another prime (210120210127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060105060 + 105060105061.

It is an arithmetic number, because the mean of its divisors is an integer number (105060105061).

Almost surely, 2^210120210121 is an apocalyptic number.

It is an amenable number.

210120210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210120210121 is an equidigital number, since it uses as much as digits as its factorization.

210120210121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210120210121 its reverse (121012021012), we get a palindrome (331132231133).

The spelling of 210120210121 in words is "two hundred ten billion, one hundred twenty million, two hundred ten thousand, one hundred twenty-one".