21255882 has 16 divisors (see below), whose sum is σ = 45012672. Its totient is φ = 6668480.

The previous prime is 21255859. The next prime is 21255919. The reversal of 21255882 is 28855212.

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 7 ways as a sum of consecutive naturals, for example, 104094 + ... + 104297.

It is an arithmetic number, because the mean of its divisors is an integer number (2813292).

Almost surely, 2^21255882 is an apocalyptic number.

21255882 is an abundant number, since it is smaller than the sum of its proper divisors (23756790).

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

21255882 is a wasteful number, since it uses less digits than its factorization.

21255882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208413.

The product of its digits is 12800, while the sum is 33.

The square root of 21255882 is about 4610.4101769799. The cubic root of 21255882 is about 277.0084667702.

The spelling of 21255882 in words is "twenty-one million, two hundred fifty-five thousand, eight hundred eighty-two".