21101122201111 has 8 divisors (see below), whose sum is σ = 21401119188000. Its totient is φ = 20801202938880.

The previous prime is 21101122201099. The next prime is 21101122201121. The reversal of 21101122201111 is 11110222110112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21101122201111 - 2⁴³ = 12305029178903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101122201121) 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 in 7 ways as a sum of consecutive naturals, for example, 18884226 + ... + 19970383.

It is an arithmetic number, because the mean of its divisors is an integer number (2675139898500).

Almost surely, 2^{21101122201111} is an apocalyptic number.

21101122201111 is a deficient number, since it is larger than the sum of its proper divisors (299996986889).

21101122201111 is an equidigital number, since it uses as much as digits as its factorization.

21101122201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38862329.

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

Adding to 21101122201111 its reverse (11110222110112), we get a palindrome (32211344311223).

Subtracting from 21101122201111 its reverse (11110222110112), we obtain a palindrome (9990900090999).

The spelling of 21101122201111 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-two million, two hundred one thousand, one hundred eleven".