210000211121 has 2 divisors, whose sum is σ = 210000211122. Its totient is φ = 210000211120.

The previous prime is 210000211117. The next prime is 210000211181. The reversal of 210000211121 is 121112000012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209983897600 + 16313521 = 458240^2 + 4039^2 .

It is a cyclic number.

It is not a de Polignac number, because 210000211121 - 2² = 210000211117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (210000211181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000105560 + 105000105561.

It is an arithmetic number, because the mean of its divisors is an integer number (105000105561).

Almost surely, 2^210000211121 is an apocalyptic number.

It is an amenable number.

210000211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210000211121 is an equidigital number, since it uses as much as digits as its factorization.

210000211121 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 210000211121 its reverse (121112000012), we get a palindrome (331112211133).

The spelling of 210000211121 in words is "two hundred ten billion, two hundred eleven thousand, one hundred twenty-one".