21469828 has 12 divisors (see below), whose sum is σ = 37615312. Its totient is φ = 10722600.

The previous prime is 21469807. The next prime is 21469843. The reversal of 21469828 is 82896412.

It is a plaindrome in base 11.

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, 1651 + ... + 6757.

Almost surely, 2^21469828 is an apocalyptic number.

It is an amenable number.

21469828 is a deficient number, since it is larger than the sum of its proper divisors (16145484).

21469828 is a wasteful number, since it uses less digits than its factorization.

21469828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6162 (or 6160 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 21469828 is about 4633.5545750536. The cubic root of 21469828 is about 277.9347534196.

The spelling of 21469828 in words is "twenty-one million, four hundred sixty-nine thousand, eight hundred twenty-eight".