21845282 has 8 divisors (see below), whose sum is σ = 32820816. Its totient is φ = 10905012.

The previous prime is 21845261. The next prime is 21845287. The reversal of 21845282 is 28254812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21845282³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21845287) 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 3 ways as a sum of consecutive naturals, for example, 7208 + ... + 9779.

It is an arithmetic number, because the mean of its divisors is an integer number (4102602).

Almost surely, 2^21845282 is an apocalyptic number.

21845282 is a deficient number, since it is larger than the sum of its proper divisors (10975534).

21845282 is a wasteful number, since it uses less digits than its factorization.

21845282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17632.

The product of its digits is 10240, while the sum is 32.

The square root of 21845282 is about 4673.8936658850. The cubic root of 21845282 is about 279.5455297516.

The spelling of 21845282 in words is "twenty-one million, eight hundred forty-five thousand, two hundred eighty-two".