21174856 has 16 divisors (see below), whose sum is σ = 39853440. Its totient is φ = 10547280.

The previous prime is 21174847. The next prime is 21174883. The reversal of 21174856 is 65847112.

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, 2716 + ... + 7051.

It is an arithmetic number, because the mean of its divisors is an integer number (2490840).

Almost surely, 2^21174856 is an apocalyptic number.

It is an amenable number.

21174856 is a deficient number, since it is larger than the sum of its proper divisors (18678584).

21174856 is a wasteful number, since it uses less digits than its factorization.

21174856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10044 (or 10040 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 21174856 is about 4601.6144992817. The cubic root of 21174856 is about 276.6560393331.

The spelling of 21174856 in words is "twenty-one million, one hundred seventy-four thousand, eight hundred fifty-six".