21174916 has 12 divisors (see below), whose sum is σ = 42349888. Its totient is φ = 9074952.

The previous prime is 21174913. The next prime is 21174929. The reversal of 21174916 is 61947112.

21174916 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21174913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378096 + ... + 378151.

Almost surely, 2^21174916 is an apocalyptic number.

It is an amenable number.

21174916 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21174916 is a wasteful number, since it uses less digits than its factorization.

21174916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756258 (or 756256 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 21174916 is about 4601.6210187281. The cubic root of 21174916 is about 276.6563006390.

The spelling of 21174916 in words is "twenty-one million, one hundred seventy-four thousand, nine hundred sixteen".