21101223111111 has 64 divisors (see below), whose sum is σ = 36729842688000. Its totient is φ = 11803739264640.

The previous prime is 21101223111107. The next prime is 21101223111113. The reversal of 21101223111111 is 11111132210112.

21101223111111 is a `hidden beast` number, since 211 + 0 + 122 + 311 + 11 + 11 = 666.

It is not a de Polignac number, because 21101223111111 - 2² = 21101223111107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101223111113) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40509505 + ... + 41027093.

It is an arithmetic number, because the mean of its divisors is an integer number (573903792000).

Almost surely, 2^{21101223111111} is an apocalyptic number.

21101223111111 is a deficient number, since it is larger than the sum of its proper divisors (15628619576889).

21101223111111 is a wasteful number, since it uses less digits than its factorization.

21101223111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528181 (or 528175 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 18.

Adding to 21101223111111 its reverse (11111132210112), we get a palindrome (32212355321223).

Subtracting from 21101223111111 its reverse (11111132210112), we obtain a palindrome (9990090900999).

It can be divided in two parts, 2110 and 1223111111, that added together give a palindrome (1223113221).

The spelling of 21101223111111 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-three million, one hundred eleven thousand, one hundred eleven".