21334828 has 6 divisors (see below), whose sum is σ = 37335956. Its totient is φ = 10667412.

The previous prime is 21334787. The next prime is 21334849. The reversal of 21334828 is 82843312.

It is a self number, because there is not a number n which added to its sum of digits gives 21334828.

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 as a sum of consecutive naturals, namely, 2666850 + ... + 2666857.

Almost surely, 2^21334828 is an apocalyptic number.

It is an amenable number.

21334828 is a deficient number, since it is larger than the sum of its proper divisors (16001128).

21334828 is a wasteful number, since it uses less digits than its factorization.

21334828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333711 (or 5333709 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 21334828 is about 4618.9639530960. The cubic root of 21334828 is about 277.3509867389.

The spelling of 21334828 in words is "twenty-one million, three hundred thirty-four thousand, eight hundred twenty-eight".