21984282 has 24 divisors (see below), whose sum is σ = 48796020. Its totient is φ = 7149120.

The previous prime is 21984257. The next prime is 21984307. The reversal of 21984282 is 28248912.

It is an interprime number because it is at equal distance from previous prime (21984257) and next prime (21984307).

It can be written as a sum of positive squares in 2 ways, for example, as 15374241 + 6610041 = 3921^2 + 2571^2 .

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 11 ways as a sum of consecutive naturals, for example, 14157 + ... + 15632.

Almost surely, 2^21984282 is an apocalyptic number.

21984282 is an abundant number, since it is smaller than the sum of its proper divisors (26811738).

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

21984282 is a wasteful number, since it uses less digits than its factorization.

21984282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29838 (or 29835 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 21984282 is about 4688.7399160116. The cubic root of 21984282 is about 280.1371861759.

The spelling of 21984282 in words is "twenty-one million, nine hundred eighty-four thousand, two hundred eighty-two".