21183242 has 8 divisors (see below), whose sum is σ = 32313600. Its totient is φ = 10412044.

The previous prime is 21183223. The next prime is 21183247. The reversal of 21183242 is 24238112.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21183247) by changing a digit.

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, 89642 + ... + 89877.

It is an arithmetic number, because the mean of its divisors is an integer number (4039200).

Almost surely, 2^21183242 is an apocalyptic number.

21183242 is a deficient number, since it is larger than the sum of its proper divisors (11130358).

21183242 is a wasteful number, since it uses less digits than its factorization.

21183242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179580.

The product of its digits is 768, while the sum is 23.

The square root of 21183242 is about 4602.5256110097. The cubic root of 21183242 is about 276.6925564069.

The spelling of 21183242 in words is "twenty-one million, one hundred eighty-three thousand, two hundred forty-two".