21845008 has 10 divisors (see below), whose sum is σ = 42324734. Its totient is φ = 10922496.

The previous prime is 21844993. The next prime is 21845029. The reversal of 21845008 is 80054812.

It can be written as a sum of positive squares in only one way, i.e., 21827584 + 17424 = 4672^2 + 132^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682641 + ... + 682672.

Almost surely, 2^21845008 is an apocalyptic number.

It is an amenable number.

21845008 is a deficient number, since it is larger than the sum of its proper divisors (20479726).

21845008 is a wasteful number, since it uses less digits than its factorization.

21845008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365321 (or 1365315 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 21845008 is about 4673.8643540437. The cubic root of 21845008 is about 279.5443609898.

The spelling of 21845008 in words is "twenty-one million, eight hundred forty-five thousand, eight".