21200112110111 has 16 divisors (see below), whose sum is σ = 23474775742848. Its totient is φ = 18983399080800.

The previous prime is 21200112110087. The next prime is 21200112110129. The reversal of 21200112110111 is 11101121100212.

It is a de Polignac number, because none of the positive numbers 2^k-21200112110111 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 (21200112113111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6570176 + ... + 9250266.

It is an arithmetic number, because the mean of its divisors is an integer number (1467173483928).

Almost surely, 2^{21200112110111} is an apocalyptic number.

21200112110111 is a deficient number, since it is larger than the sum of its proper divisors (2274663632737).

21200112110111 is a wasteful number, since it uses less digits than its factorization.

21200112110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690902.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21200112110111 its reverse (11101121100212), we get a palindrome (32301233210323).

The spelling of 21200112110111 in words is "twenty-one trillion, two hundred billion, one hundred twelve million, one hundred ten thousand, one hundred eleven".