210111110221 has 2 divisors, whose sum is σ = 210111110222. Its totient is φ = 210111110220.

The previous prime is 210111110189. The next prime is 210111110239. The reversal of 210111110221 is 122011111012.

It is a happy number.

210111110221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155642085225 + 54469024996 = 394515^2 + 233386^2 .

It is a cyclic number.

It is not a de Polignac number, because 210111110221 - 2⁵ = 210111110189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210111110821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105055555110 + 105055555111.

It is an arithmetic number, because the mean of its divisors is an integer number (105055555111).

Almost surely, 2^210111110221 is an apocalyptic number.

It is an amenable number.

210111110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210111110221 is an equidigital number, since it uses as much as digits as its factorization.

210111110221 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 13.

Adding to 210111110221 its reverse (122011111012), we get a palindrome (332122221233).

The spelling of 210111110221 in words is "two hundred ten billion, one hundred eleven million, one hundred ten thousand, two hundred twenty-one".