21848805 has 32 divisors (see below), whose sum is σ = 42376320. Its totient is φ = 10592640.

The previous prime is 21848753. The next prime is 21848809. The reversal of 21848805 is 50884812.

It is not a de Polignac number, because 21848805 - 2⁶ = 21848741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21848805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848809) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 5872 + ... + 8841.

It is an arithmetic number, because the mean of its divisors is an integer number (1324260).

Almost surely, 2^21848805 is an apocalyptic number.

It is an amenable number.

21848805 is a deficient number, since it is larger than the sum of its proper divisors (20527515).

21848805 is a wasteful number, since it uses less digits than its factorization.

21848805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14738 (or 14732 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 21848805 is about 4674.2705313236. The cubic root of 21848805 is about 279.5605564282.

The spelling of 21848805 in words is "twenty-one million, eight hundred forty-eight thousand, eight hundred five".