210211121 has 2 divisors, whose sum is σ = 210211122. Its totient is φ = 210211120.

The previous prime is 210211109. The next prime is 210211123. The reversal of 210211121 is 121112012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170015521 + 40195600 = 13039^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 210211121 - 2¹⁴ = 210194737 is a prime.

It is a Sophie Germain prime.

Together with 210211123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (210211123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105560 + 105105561.

It is an arithmetic number, because the mean of its divisors is an integer number (105105561).

Almost surely, 2^210211121 is an apocalyptic number.

It is an amenable number.

210211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210211121 is an equidigital number, since it uses as much as digits as its factorization.

210211121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 210211121 is about 14498.6592828441. The cubic root of 210211121 is about 594.5913169355.

Adding to 210211121 its reverse (121112012), we get a palindrome (331323133).

The spelling of 210211121 in words is "two hundred ten million, two hundred eleven thousand, one hundred twenty-one".