21112021133 has 48 divisors (see below), whose sum is σ = 26203046400. Its totient is φ = 16652259072.

The previous prime is 21112021111. The next prime is 21112021157. The reversal of 21112021133 is 33112021112.

It is not a de Polignac number, because 21112021133 - 2¹² = 21112017037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112021193) 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 47 ways as a sum of consecutive naturals, for example, 17695985 + ... + 17697177.

It is an arithmetic number, because the mean of its divisors is an integer number (545896800).

Almost surely, 2^21112021133 is an apocalyptic number.

It is an amenable number.

21112021133 is a deficient number, since it is larger than the sum of its proper divisors (5091025267).

21112021133 is a wasteful number, since it uses less digits than its factorization.

21112021133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434 (or 1415 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21112021133 its reverse (33112021112), we get a palindrome (54224042245).

The spelling of 21112021133 in words is "twenty-one billion, one hundred twelve million, twenty-one thousand, one hundred thirty-three".