21466828 has 12 divisors (see below), whose sum is σ = 38043040. Its totient is φ = 10597392.

The previous prime is 21466807. The next prime is 21466829. The reversal of 21466828 is 82866412.

It is not an unprimeable number, because it can be changed into a prime (21466829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33651 + ... + 34282.

Almost surely, 2^21466828 is an apocalyptic number.

It is an amenable number.

21466828 is a deficient number, since it is larger than the sum of its proper divisors (16576212).

21466828 is a wasteful number, since it uses less digits than its factorization.

21466828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68016 (or 68014 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 21466828 is about 4633.2308381949. The cubic root of 21466828 is about 277.9218074519.

The spelling of 21466828 in words is "twenty-one million, four hundred sixty-six thousand, eight hundred twenty-eight".