21323133 has 24 divisors (see below), whose sum is σ = 34245120. Its totient is φ = 12696480.

The previous prime is 21323129. The next prime is 21323153. The reversal of 21323133 is 33132312.

It is not a de Polignac number, because 21323133 - 2² = 21323129 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 688 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (1426880).

Almost surely, 2^21323133 is an apocalyptic number.

It is an amenable number.

21323133 is a deficient number, since it is larger than the sum of its proper divisors (12921987).

21323133 is a wasteful number, since it uses less digits than its factorization.

21323133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5929 (or 5926 counting only the distinct ones).

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

The square root of 21323133 is about 4617.6978030183. The cubic root of 21323133 is about 277.3002994675.

Adding to 21323133 its reverse (33132312), we get a palindrome (54455445).

The spelling of 21323133 in words is "twenty-one million, three hundred twenty-three thousand, one hundred thirty-three".