21003848 has 8 divisors (see below), whose sum is σ = 39382230. Its totient is φ = 10501920.

The previous prime is 21003821. The next prime is 21003869. The reversal of 21003848 is 84830012.

It can be written as a sum of positive squares in only one way, i.e., 20775364 + 228484 = 4558^2 + 478^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312733 + ... + 1312748.

Almost surely, 2^21003848 is an apocalyptic number.

It is an amenable number.

21003848 is a deficient number, since it is larger than the sum of its proper divisors (18378382).

21003848 is a wasteful number, since it uses less digits than its factorization.

21003848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625487 (or 2625483 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21003848 is about 4582.9955269452. The cubic root of 21003848 is about 275.9092679426.

The spelling of 21003848 in words is "twenty-one million, three thousand, eight hundred forty-eight".