21183404 has 24 divisors (see below), whose sum is σ = 42571200. Its totient is φ = 9121680.

The previous prime is 21183389. The next prime is 21183431. The reversal of 21183404 is 40438112.

It is a self number, because there is not a number n which added to its sum of digits gives 21183404.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11834 + ... + 13505.

It is an arithmetic number, because the mean of its divisors is an integer number (1773800).

Almost surely, 2^21183404 is an apocalyptic number.

It is an amenable number.

21183404 is an abundant number, since it is smaller than the sum of its proper divisors (21387796).

21183404 is a wasteful number, since it uses less digits than its factorization.

21183404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25373 (or 25371 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21183404 is about 4602.5432100090. The cubic root of 21183404 is about 276.6932617456.

The spelling of 21183404 in words is "twenty-one million, one hundred eighty-three thousand, four hundred four".