21311201133 has 24 divisors (see below), whose sum is σ = 32133121176. Its totient is φ = 13596854400.

The previous prime is 21311201123. The next prime is 21311201179. The reversal of 21311201133 is 33110211312.

21311201133 is a `hidden beast` number, since 21 + 311 + 201 + 133 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2989683684 + 18321517449 = 54678^2 + 135357^2 .

It is not a de Polignac number, because 21311201133 - 2⁵ = 21311201101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311201123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 504258 + ... + 544883.

It is an arithmetic number, because the mean of its divisors is an integer number (1338880049).

Almost surely, 2^21311201133 is an apocalyptic number.

It is an amenable number.

21311201133 is a deficient number, since it is larger than the sum of its proper divisors (10821920043).

21311201133 is a wasteful number, since it uses less digits than its factorization.

21311201133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049245 (or 1049242 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21311201133 its reverse (33110211312), we get a palindrome (54421412445).

The spelling of 21311201133 in words is "twenty-one billion, three hundred eleven million, two hundred one thousand, one hundred thirty-three".