21133112211 has 12 divisors (see below), whose sum is σ = 30868592040. Its totient is φ = 13930440480.

The previous prime is 21133112191. The next prime is 21133112219. The reversal of 21133112211 is 11221133112.

21133112211 is a `hidden beast` number, since 211 + 331 + 122 + 1 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21133112211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21133112219) 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 11 ways as a sum of consecutive naturals, for example, 13190905 + ... + 13192506.

It is an arithmetic number, because the mean of its divisors is an integer number (2572382670).

Almost surely, 2^21133112211 is an apocalyptic number.

21133112211 is a deficient number, since it is larger than the sum of its proper divisors (9735479829).

21133112211 is a wasteful number, since it uses less digits than its factorization.

21133112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26383506 (or 26383503 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 21133112211 its reverse (11221133112), we get a palindrome (32354245323).

The spelling of 21133112211 in words is "twenty-one billion, one hundred thirty-three million, one hundred twelve thousand, two hundred eleven".