21642882 has 8 divisors (see below), whose sum is σ = 43285776. Its totient is φ = 7214292.

The previous prime is 21642871. The next prime is 21642883. The reversal of 21642882 is 28824612.

It is a happy number.

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

21642882 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21642883) 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, 1803568 + ... + 1803579.

It is an arithmetic number, because the mean of its divisors is an integer number (5410722).

Almost surely, 2^21642882 is an apocalyptic number.

21642882 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21642882 is a wasteful number, since it uses less digits than its factorization.

21642882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607152.

The product of its digits is 12288, while the sum is 33.

The square root of 21642882 is about 4652.1910966769. The cubic root of 21642882 is about 278.6795050542.

The spelling of 21642882 in words is "twenty-one million, six hundred forty-two thousand, eight hundred eighty-two".