21323333 has 4 divisors (see below), whose sum is σ = 21336000. Its totient is φ = 21310668.

The previous prime is 21323311. The next prime is 21323371. The reversal of 21323333 is 33332312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21323333 - 2⁸ = 21323077 is a prime.

It is a Duffinian number.

21323333 is a modest number, since divided by 3333 gives 2132 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335 + ... + 7332.

It is an arithmetic number, because the mean of its divisors is an integer number (5334000).

Almost surely, 2^21323333 is an apocalyptic number.

It is an amenable number.

21323333 is a deficient number, since it is larger than the sum of its proper divisors (12667).

21323333 is a wasteful number, since it uses less digits than its factorization.

21323333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12666.

The product of its digits is 972, while the sum is 20.

The square root of 21323333 is about 4617.7194587805. The cubic root of 21323333 is about 277.3011664428.

Adding to 21323333 its reverse (33332312), we get a palindrome (54655645).

The spelling of 21323333 in words is "twenty-one million, three hundred twenty-three thousand, three hundred thirty-three".