21848845 has 8 divisors (see below), whose sum is σ = 26257176. Its totient is φ = 17453376.

The previous prime is 21848809. The next prime is 21848857. The reversal of 21848845 is 54884812.

It can be written as a sum of positive squares in 4 ways, for example, as 927369 + 20921476 = 963^2 + 4574^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21848845 - 2¹⁹ = 21324557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21848798 and 21848807.

It is a congruent number.

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, 1039 + ... + 6691.

It is an arithmetic number, because the mean of its divisors is an integer number (3282147).

Almost surely, 2^21848845 is an apocalyptic number.

It is an amenable number.

21848845 is a deficient number, since it is larger than the sum of its proper divisors (4408331).

21848845 is an equidigital number, since it uses as much as digits as its factorization.

21848845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6431.

The product of its digits is 81920, while the sum is 40.

The square root of 21848845 is about 4674.2748100641. The cubic root of 21848845 is about 279.5607270312.

The spelling of 21848845 in words is "twenty-one million, eight hundred forty-eight thousand, eight hundred forty-five".