21333132 has 30 divisors (see below), whose sum is σ = 55769868. Its totient is φ = 7110936.

The previous prime is 21333107. The next prime is 21333133. The reversal of 21333132 is 23133312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is not an unprimeable number, because it can be changed into a prime (21333133) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 32598 + ... + 33245.

Almost surely, 2^21333132 is an apocalyptic number.

It is an amenable number.

21333132 is an abundant number, since it is smaller than the sum of its proper divisors (34436736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21333132 is a wasteful number, since it uses less digits than its factorization.

21333132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65859 (or 65848 counting only the distinct ones).

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

The square root of 21333132 is about 4618.7803584929. The cubic root of 21333132 is about 277.3436372579.

Adding to 21333132 its reverse (23133312), we get a palindrome (44466444).

The spelling of 21333132 in words is "twenty-one million, three hundred thirty-three thousand, one hundred thirty-two".