21101122210111 has 2 divisors, whose sum is σ = 21101122210112. Its totient is φ = 21101122210110.

The previous prime is 21101122210109. The next prime is 21101122210121. The reversal of 21101122210111 is 11101222110112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101122210111 - 2¹ = 21101122210109 is a prime.

Together with 21101122210109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101122210121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550561105055 + 10550561105056.

It is an arithmetic number, because the mean of its divisors is an integer number (10550561105056).

Almost surely, 2^{21101122210111} is an apocalyptic number.

21101122210111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101122210111 is an equidigital number, since it uses as much as digits as its factorization.

21101122210111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21101122210111 its reverse (11101222110112), we get a palindrome (32202344320223).

Subtracting from 21101122210111 its reverse (11101222110112), we obtain a palindrome (9999900099999).

The spelling of 21101122210111 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-two million, two hundred ten thousand, one hundred eleven".