21882642 has 16 divisors (see below), whose sum is σ = 46068960. Its totient is φ = 6910272.

The previous prime is 21882613. The next prime is 21882667. The reversal of 21882642 is 24628812.

It is a happy 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, 95863 + ... + 96090.

It is an arithmetic number, because the mean of its divisors is an integer number (2879310).

Almost surely, 2^21882642 is an apocalyptic number.

21882642 is an abundant number, since it is smaller than the sum of its proper divisors (24186318).

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

21882642 is a wasteful number, since it uses less digits than its factorization.

21882642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191977.

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

The square root of 21882642 is about 4677.8886262928. Note that the first 3 decimals coincide. The cubic root of 21882642 is about 279.7047994272.

The spelling of 21882642 in words is "twenty-one million, eight hundred eighty-two thousand, six hundred forty-two".