21133111211 has 8 divisors (see below), whose sum is σ = 21342213984. Its totient is φ = 20924084160.

The previous prime is 21133111201. The next prime is 21133111231. The reversal of 21133111211 is 11211133112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21133111211 - 2³⁰ = 20059369387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21133111211.

It is not an unprimeable number, because it can be changed into a prime (21133111201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662255 + ... + 693431.

It is an arithmetic number, because the mean of its divisors is an integer number (2667776748).

Almost surely, 2^21133111211 is an apocalyptic number.

21133111211 is a deficient number, since it is larger than the sum of its proper divisors (209102773).

21133111211 is a wasteful number, since it uses less digits than its factorization.

21133111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37861.

The product of its digits is 36, while the sum is 17.

Adding to 21133111211 its reverse (11211133112), we get a palindrome (32344244323).

The spelling of 21133111211 in words is "twenty-one billion, one hundred thirty-three million, one hundred eleven thousand, two hundred eleven".