21112011110171 has 2 divisors, whose sum is σ = 21112011110172. Its totient is φ = 21112011110170.

The previous prime is 21112011110087. The next prime is 21112011110173. The reversal of 21112011110171 is 17101111021112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112011110171 - 2²⁶ = 21111944001307 is a prime.

Together with 21112011110173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21112011110173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556005555085 + 10556005555086.

It is an arithmetic number, because the mean of its divisors is an integer number (10556005555086).

Almost surely, 2^{21112011110171} is an apocalyptic number.

21112011110171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112011110171 is an equidigital number, since it uses as much as digits as its factorization.

21112011110171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 20.

Adding to 21112011110171 its reverse (17101111021112), we get a palindrome (38213122131283).

The spelling of 21112011110171 in words is "twenty-one trillion, one hundred twelve billion, eleven million, one hundred ten thousand, one hundred seventy-one".