21282884 has 12 divisors (see below), whose sum is σ = 42565824. Its totient is φ = 9121224.

The previous prime is 21282871. The next prime is 21282901. The reversal of 21282884 is 48828212.

21282884 is an admirable number.

It is a super-2 number, since 2×21282884² = 905922302714912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380024 + ... + 380079.

It is an arithmetic number, because the mean of its divisors is an integer number (3547152).

Almost surely, 2^21282884 is an apocalyptic number.

It is an amenable number.

21282884 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.

21282884 is a wasteful number, since it uses less digits than its factorization.

21282884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760114 (or 760112 counting only the distinct ones).

The product of its digits is 16384, while the sum is 35.

The square root of 21282884 is about 4613.3376204219. The cubic root of 21282884 is about 277.1257145919.

The spelling of 21282884 in words is "twenty-one million, two hundred eighty-two thousand, eight hundred eighty-four".