21646892 has 12 divisors (see below), whose sum is σ = 38250576. Its totient is φ = 10718160.

The previous prime is 21646879. The next prime is 21646913. The reversal of 21646892 is 29864612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25859 + ... + 26682.

It is an arithmetic number, because the mean of its divisors is an integer number (3187548).

Almost surely, 2^21646892 is an apocalyptic number.

It is an amenable number.

21646892 is a deficient number, since it is larger than the sum of its proper divisors (16603684).

21646892 is a wasteful number, since it uses less digits than its factorization.

21646892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52648 (or 52646 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 21646892 is about 4652.6220564323. The cubic root of 21646892 is about 278.6967152669.

The spelling of 21646892 in words is "twenty-one million, six hundred forty-six thousand, eight hundred ninety-two".