21633382 has 8 divisors (see below), whose sum is σ = 33327216. Its totient is φ = 10524312.

The previous prime is 21633379. The next prime is 21633413. The reversal of 21633382 is 28333612.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21633382.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146098 + ... + 146245.

It is an arithmetic number, because the mean of its divisors is an integer number (4165902).

Almost surely, 2^21633382 is an apocalyptic number.

21633382 is a deficient number, since it is larger than the sum of its proper divisors (11693834).

21633382 is a wasteful number, since it uses less digits than its factorization.

21633382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292382.

The product of its digits is 5184, while the sum is 28.

The square root of 21633382 is about 4651.1699603433. The cubic root of 21633382 is about 278.6387242446.

Adding to 21633382 its reverse (28333612), we get a palindrome (49966994).

The spelling of 21633382 in words is "twenty-one million, six hundred thirty-three thousand, three hundred eighty-two".