21850844 has 12 divisors (see below), whose sum is σ = 38810184. Its totient is φ = 10762224.

The previous prime is 21850819. The next prime is 21850849. The reversal of 21850844 is 44805812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21850844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40499 + ... + 41034.

It is an arithmetic number, because the mean of its divisors is an integer number (3234182).

Almost surely, 2^21850844 is an apocalyptic number.

It is an amenable number.

21850844 is a deficient number, since it is larger than the sum of its proper divisors (16959340).

21850844 is a wasteful number, since it uses less digits than its factorization.

21850844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81604 (or 81602 counting only the distinct ones).

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

The square root of 21850844 is about 4674.4886351343. The cubic root of 21850844 is about 279.5692526512.

The spelling of 21850844 in words is "twenty-one million, eight hundred fifty thousand, eight hundred forty-four".