21231332133 has 16 divisors (see below), whose sum is σ = 31405363200. Its totient is φ = 12649380080.

The previous prime is 21231332093. The next prime is 21231332153. The reversal of 21231332133 is 33123313212.

It is a cyclic number.

It is not a de Polignac number, because 21231332133 - 2²¹ = 21229234981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231332153) 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 15 ways as a sum of consecutive naturals, for example, 5450373 + ... + 5454266.

It is an arithmetic number, because the mean of its divisors is an integer number (1962835200).

Almost surely, 2^21231332133 is an apocalyptic number.

It is an amenable number.

21231332133 is a deficient number, since it is larger than the sum of its proper divisors (10174031067).

21231332133 is a wasteful number, since it uses less digits than its factorization.

21231332133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10904712.

The product of its digits is 1944, while the sum is 24.

Adding to 21231332133 its reverse (33123313212), we get a palindrome (54354645345).

The spelling of 21231332133 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-two thousand, one hundred thirty-three".