21100110020111 has 4 divisors (see below), whose sum is σ = 21110602369224. Its totient is φ = 21089617671000.

The previous prime is 21100110020089. The next prime is 21100110020117. The reversal of 21100110020111 is 11102001100112.

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

It is a cyclic number.

It is not a de Polignac number, because 21100110020111 - 2²⁶ = 21100042911247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100110020092 and 21100110020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100110020117) 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, 5246171540 + ... + 5246175561.

It is an arithmetic number, because the mean of its divisors is an integer number (5277650592306).

Almost surely, 2^{21100110020111} is an apocalyptic number.

21100110020111 is a deficient number, since it is larger than the sum of its proper divisors (10492349113).

21100110020111 is a wasteful number, since it uses less digits than its factorization.

21100110020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10492349112.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21100110020111 its reverse (11102001100112), we get a palindrome (32202111120223).

The spelling of 21100110020111 in words is "twenty-one trillion, one hundred billion, one hundred ten million, twenty thousand, one hundred eleven".