21048208 has 20 divisors (see below), whose sum is σ = 41552028. Its totient is φ = 10325120.

The previous prime is 21048173. The next prime is 21048221. The reversal of 21048208 is 80284012.

It can be written as a sum of positive squares in 2 ways, for example, as 8573184 + 12475024 = 2928^2 + 3532^2 .

It is a super-2 number, since 2×21048208² = 886054120022528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11563 + ... + 13258.

Almost surely, 2^21048208 is an apocalyptic number.

It is an amenable number.

21048208 is a deficient number, since it is larger than the sum of its proper divisors (20503820).

21048208 is a wasteful number, since it uses less digits than its factorization.

21048208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24882 (or 24876 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 21048208 is about 4587.8326037466. The cubic root of 21048208 is about 276.1033709272.

The spelling of 21048208 in words is "twenty-one million, forty-eight thousand, two hundred eight".