21094828 has 24 divisors (see below), whose sum is σ = 38031840. Its totient is φ = 10231680.

The previous prime is 21094823. The next prime is 21094831. The reversal of 21094828 is 82849012.

It is a junction number, because it is equal to n+sod(n) for n = 21094793 and 21094802.

It is not an unprimeable number, because it can be changed into a prime (21094823) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 47833 + ... + 48271.

It is an arithmetic number, because the mean of its divisors is an integer number (1584660).

Almost surely, 2^21094828 is an apocalyptic number.

It is an amenable number.

21094828 is a deficient number, since it is larger than the sum of its proper divisors (16937012).

21094828 is a wasteful number, since it uses less digits than its factorization.

21094828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 21094828 is about 4592.9106239943. The cubic root of 21094828 is about 276.3070691456.

The spelling of 21094828 in words is "twenty-one million, ninety-four thousand, eight hundred twenty-eight".