21233021333 has 4 divisors (see below), whose sum is σ = 21246695148. Its totient is φ = 21219347520.

The previous prime is 21233021323. The next prime is 21233021387. The reversal of 21233021333 is 33312033212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12043306564 + 9189714769 = 109742^2 + 95863^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233021333 - 2⁸ = 21233021077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233021299 and 21233021308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233021323) 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 3 ways as a sum of consecutive naturals, for example, 6834578 + ... + 6837683.

It is an arithmetic number, because the mean of its divisors is an integer number (5311673787).

Almost surely, 2^21233021333 is an apocalyptic number.

It is an amenable number.

21233021333 is a deficient number, since it is larger than the sum of its proper divisors (13673815).

21233021333 is a wasteful number, since it uses less digits than its factorization.

21233021333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13673814.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21233021333 its reverse (33312033212), we get a palindrome (54545054545).

The spelling of 21233021333 in words is "twenty-one billion, two hundred thirty-three million, twenty-one thousand, three hundred thirty-three".