21328382 has 8 divisors (see below), whose sum is σ = 32535000. Its totient is φ = 10483384.

The previous prime is 21328381. The next prime is 21328399. The reversal of 21328382 is 28382312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21328381) 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, 90257 + ... + 90492.

It is an arithmetic number, because the mean of its divisors is an integer number (4066875).

Almost surely, 2^21328382 is an apocalyptic number.

21328382 is a deficient number, since it is larger than the sum of its proper divisors (11206618).

21328382 is a wasteful number, since it uses less digits than its factorization.

21328382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180810.

The product of its digits is 4608, while the sum is 29.

The square root of 21328382 is about 4618.2661248568. The cubic root of 21328382 is about 277.3230514376.

The spelling of 21328382 in words is "twenty-one million, three hundred twenty-eight thousand, three hundred eighty-two".