21330332 has 24 divisors (see below), whose sum is σ = 38610432. Its totient is φ = 10304000.

The previous prime is 21330313. The next prime is 21330347. The reversal of 21330332 is 23303312.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21330332.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17957 + ... + 19107.

It is an arithmetic number, because the mean of its divisors is an integer number (1608768).

Almost surely, 2^21330332 is an apocalyptic number.

It is an amenable number.

21330332 is a deficient number, since it is larger than the sum of its proper divisors (17280100).

21330332 is a wasteful number, since it uses less digits than its factorization.

21330332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1307 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 17.

The square root of 21330332 is about 4618.4772382247. The cubic root of 21330332 is about 277.3315028284.

Adding to 21330332 its reverse (23303312), we get a palindrome (44633644).

The spelling of 21330332 in words is "twenty-one million, three hundred thirty thousand, three hundred thirty-two".