21100212200111 has 16 divisors (see below), whose sum is σ = 23065423920000. Its totient is φ = 19142838530400.

The previous prime is 21100212200107. The next prime is 21100212200113. The reversal of 21100212200111 is 11100221200112.

It is a cyclic number.

It is not a de Polignac number, because 21100212200111 - 2² = 21100212200107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100212200113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186904400 + ... + 187017258.

It is an arithmetic number, because the mean of its divisors is an integer number (1441588995000).

Almost surely, 2^{21100212200111} is an apocalyptic number.

21100212200111 is a deficient number, since it is larger than the sum of its proper divisors (1965211719889).

21100212200111 is a wasteful number, since it uses less digits than its factorization.

21100212200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147430.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21100212200111 its reverse (11100221200112), we get a palindrome (32200433400223).

Subtracting from 21100212200111 its reverse (11100221200112), we obtain a palindrome (9999990999999).

The spelling of 21100212200111 in words is "twenty-one trillion, one hundred billion, two hundred twelve million, two hundred thousand, one hundred eleven".