21102102222111 has 12 divisors (see below), whose sum is σ = 30635539269192. Its totient is φ = 13996656633456.

The previous prime is 21102102222073. The next prime is 21102102222119. The reversal of 21102102222111 is 11122220120112.

21102102222111 is a `hidden beast` number, since 21 + 1 + 0 + 210 + 222 + 211 + 1 = 666.

It is not a de Polignac number, because 21102102222111 - 2⁷ = 21102102221983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102102222119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5950957681 + ... + 5950961226.

It is an arithmetic number, because the mean of its divisors is an integer number (2552961605766).

Almost surely, 2^{21102102222111} is an apocalyptic number.

21102102222111 is a deficient number, since it is larger than the sum of its proper divisors (9533437047081).

21102102222111 is a wasteful number, since it uses less digits than its factorization.

21102102222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11901919110 (or 11901919107 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21102102222111 its reverse (11122220120112), we get a palindrome (32224322342223).

The spelling of 21102102222111 in words is "twenty-one trillion, one hundred two billion, one hundred two million, two hundred twenty-two thousand, one hundred eleven".