21112211100111 has 16 divisors (see below), whose sum is σ = 30432016003200. Its totient is φ = 12973648925088.

The previous prime is 21112211100109. The next prime is 21112211100133. The reversal of 21112211100111 is 11100111221112.

It is not a de Polignac number, because 21112211100111 - 2¹ = 21112211100109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112211100151) 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, 5005263681 + ... + 5005267898.

It is an arithmetic number, because the mean of its divisors is an integer number (1902001000200).

Almost surely, 2^{21112211100111} is an apocalyptic number.

21112211100111 is a deficient number, since it is larger than the sum of its proper divisors (9319804903089).

21112211100111 is a wasteful number, since it uses less digits than its factorization.

21112211100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010531638.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21112211100111 its reverse (11100111221112), we get a palindrome (32212322321223).

The spelling of 21112211100111 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, one hundred thousand, one hundred eleven".