21112020020891 has 2 divisors, whose sum is σ = 21112020020892. Its totient is φ = 21112020020890.

The previous prime is 21112020020867. The next prime is 21112020020893. The reversal of 21112020020891 is 19802002021112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112020020891 - 2³⁰ = 21110946279067 is a prime.

Together with 21112020020893, 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 (21112020020893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556010010445 + 10556010010446.

It is an arithmetic number, because the mean of its divisors is an integer number (10556010010446).

Almost surely, 2^{21112020020891} is an apocalyptic number.

21112020020891 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112020020891 is an equidigital number, since it uses as much as digits as its factorization.

21112020020891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 21112020020891 in words is "twenty-one trillion, one hundred twelve billion, twenty million, twenty thousand, eight hundred ninety-one".