21233133 has 12 divisors (see below), whose sum is σ = 31728060. Its totient is φ = 13667136.

The previous prime is 21233131. The next prime is 21233161. The reversal of 21233133 is 33133212.

It can be written as a sum of positive squares in 2 ways, for example, as 14040009 + 7193124 = 3747^2 + 2682^2 .

It is not a de Polignac number, because 21233133 - 2¹ = 21233131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40416 + ... + 40937.

It is an arithmetic number, because the mean of its divisors is an integer number (2644005).

Almost surely, 2^21233133 is an apocalyptic number.

It is an amenable number.

21233133 is a deficient number, since it is larger than the sum of its proper divisors (10494927).

21233133 is a wasteful number, since it uses less digits than its factorization.

21233133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81388 (or 81385 counting only the distinct ones).

The product of its digits is 324, while the sum is 18.

The square root of 21233133 is about 4607.9423824523. The cubic root of 21233133 is about 276.9096091919.

Adding to 21233133 its reverse (33133212), we get a palindrome (54366345).

The spelling of 21233133 in words is "twenty-one million, two hundred thirty-three thousand, one hundred thirty-three".