21104828 has 6 divisors (see below), whose sum is σ = 36933456. Its totient is φ = 10552412.

The previous prime is 21104819. The next prime is 21104843. The reversal of 21104828 is 82840112.

It is a junction number, because it is equal to n+sod(n) for n = 21104797 and 21104806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638100 + ... + 2638107.

It is an arithmetic number, because the mean of its divisors is an integer number (6155576).

Almost surely, 2^21104828 is an apocalyptic number.

It is an amenable number.

21104828 is a deficient number, since it is larger than the sum of its proper divisors (15828628).

21104828 is a wasteful number, since it uses less digits than its factorization.

21104828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5276211 (or 5276209 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 21104828 is about 4593.9991292990. Note that the first 3 decimals coincide. The cubic root of 21104828 is about 276.3507233563.

The spelling of 21104828 in words is "twenty-one million, one hundred four thousand, eight hundred twenty-eight".