21284382 has 32 divisors (see below), whose sum is σ = 48787200. Its totient is φ = 6064128.

The previous prime is 21284381. The next prime is 21284387. The reversal of 21284382 is 28348212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21284381) 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 15 ways as a sum of consecutive naturals, for example, 27294 + ... + 28062.

It is an arithmetic number, because the mean of its divisors is an integer number (1524600).

Almost surely, 2^21284382 is an apocalyptic number.

It is a pronic number, being equal to 4613×4614.

21284382 is an abundant number, since it is smaller than the sum of its proper divisors (27502818).

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

21284382 is a wasteful number, since it uses less digits than its factorization.

21284382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its digits is 6144, while the sum is 30.

The square root of 21284382 is about 4613.4999729056. The cubic root of 21284382 is about 277.1322162887.

The spelling of 21284382 in words is "twenty-one million, two hundred eighty-four thousand, three hundred eighty-two".