21093404 has 24 divisors (see below), whose sum is σ = 38112480. Its totient is φ = 10207296.

The previous prime is 21093377. The next prime is 21093407. The reversal of 21093404 is 40439012.

It is a self number, because there is not a number n which added to its sum of digits gives 21093404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21093407) 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, 52934 + ... + 53330.

It is an arithmetic number, because the mean of its divisors is an integer number (1588020).

Almost surely, 2^21093404 is an apocalyptic number.

It is an amenable number.

21093404 is a deficient number, since it is larger than the sum of its proper divisors (17019076).

21093404 is a wasteful number, since it uses less digits than its factorization.

21093404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21093404 is about 4592.7555998551. The cubic root of 21093404 is about 276.3008516640.

The spelling of 21093404 in words is "twenty-one million, ninety-three thousand, four hundred four".