21101120100111 has 4 divisors (see below), whose sum is σ = 28134826800152. Its totient is φ = 14067413400072.

The previous prime is 21101120100023. The next prime is 21101120100169. The reversal of 21101120100111 is 11100102110112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21101120100111 - 2²⁹ = 21100583229199 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 (21101120120111) 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 3 ways as a sum of consecutive naturals, for example, 3516853350016 + ... + 3516853350021.

It is an arithmetic number, because the mean of its divisors is an integer number (7033706700038).

Almost surely, 2^{21101120100111} is an apocalyptic number.

21101120100111 is a deficient number, since it is larger than the sum of its proper divisors (7033706700041).

21101120100111 is an equidigital number, since it uses as much as digits as its factorization.

21101120100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7033706700040.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21101120100111 its reverse (11100102110112), we get a palindrome (32201222210223).

The spelling of 21101120100111 in words is "twenty-one trillion, one hundred one billion, one hundred twenty million, one hundred thousand, one hundred eleven".