21476828 has 6 divisors (see below), whose sum is σ = 37584456. Its totient is φ = 10738412.

The previous prime is 21476827. The next prime is 21476837. The reversal of 21476828 is 82867412.

It is a super-2 number, since 2×21476828² = 922508281883168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21476791 and 21476800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21476827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2684600 + ... + 2684607.

It is an arithmetic number, because the mean of its divisors is an integer number (6264076).

Almost surely, 2^21476828 is an apocalyptic number.

It is an amenable number.

21476828 is a deficient number, since it is larger than the sum of its proper divisors (16107628).

21476828 is a wasteful number, since it uses less digits than its factorization.

21476828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5369211 (or 5369209 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 21476828 is about 4634.3098731095. The cubic root of 21476828 is about 277.9649559884.

The spelling of 21476828 in words is "twenty-one million, four hundred seventy-six thousand, eight hundred twenty-eight".