21010122110191 has 2 divisors, whose sum is σ = 21010122110192. Its totient is φ = 21010122110190.

The previous prime is 21010122110179. The next prime is 21010122110269. The reversal of 21010122110191 is 19101122101012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010122110191 - 2¹⁹ = 21010121585903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010122113191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505061055095 + 10505061055096.

It is an arithmetic number, because the mean of its divisors is an integer number (10505061055096).

Almost surely, 2^{21010122110191} is an apocalyptic number.

21010122110191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010122110191 is an equidigital number, since it uses as much as digits as its factorization.

21010122110191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 21010122110191 in words is "twenty-one trillion, ten billion, one hundred twenty-two million, one hundred ten thousand, one hundred ninety-one".