110210210021 has 2 divisors, whose sum is σ = 110210210022. Its totient is φ = 110210210020.

The previous prime is 110210209939. The next prime is 110210210053. The reversal of 110210210021 is 120012012011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81659349121 + 28550860900 = 285761^2 + 168970^2 .

It is a cyclic number.

It is not a de Polignac number, because 110210210021 - 2³⁰ = 109136468197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 110210209984 and 110210210011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110210210081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55105105010 + 55105105011.

It is an arithmetic number, because the mean of its divisors is an integer number (55105105011).

Almost surely, 2^110210210021 is an apocalyptic number.

It is an amenable number.

110210210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

110210210021 is an equidigital number, since it uses as much as digits as its factorization.

110210210021 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 110210210021 its reverse (120012012011), we get a palindrome (230222222032).

The spelling of 110210210021 in words is "one hundred ten billion, two hundred ten million, two hundred ten thousand, twenty-one".