210118121 has 2 divisors, whose sum is σ = 210118122. Its totient is φ = 210118120.

The previous prime is 210118091. The next prime is 210118123. The reversal of 210118121 is 121811012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201498025 + 8620096 = 14195^2 + 2936^2 .

It is a cyclic number.

It is not a de Polignac number, because 210118121 - 2¹⁴ = 210101737 is a prime.

Together with 210118123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210118121.

It is not a weakly prime, because it can be changed into another prime (210118123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105059060 + 105059061.

It is an arithmetic number, because the mean of its divisors is an integer number (105059061).

Almost surely, 2^210118121 is an apocalyptic number.

It is an amenable number.

210118121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210118121 is an equidigital number, since it uses as much as digits as its factorization.

210118121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

The square root of 210118121 is about 14495.4517349409. The cubic root of 210118121 is about 594.5036191504.

Adding to 210118121 its reverse (121811012), we get a palindrome (331929133).

The spelling of 210118121 in words is "two hundred ten million, one hundred eighteen thousand, one hundred twenty-one".