21823282 has 16 divisors (see below), whose sum is σ = 35443800. Its totient is φ = 10017792.

The previous prime is 21823271. The next prime is 21823301. The reversal of 21823282 is 28232812.

It can be written as a sum of positive squares in 4 ways, for example, as 5574321 + 16248961 = 2361^2 + 4031^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21823282.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2844 + ... + 7192.

Almost surely, 2^21823282 is an apocalyptic number.

21823282 is a deficient number, since it is larger than the sum of its proper divisors (13620518).

21823282 is a wasteful number, since it uses less digits than its factorization.

21823282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4557.

The product of its digits is 3072, while the sum is 28.

The square root of 21823282 is about 4671.5395749153. The cubic root of 21823282 is about 279.4516564333.

The spelling of 21823282 in words is "twenty-one million, eight hundred twenty-three thousand, two hundred eighty-two".