21004203404 has 24 divisors (see below), whose sum is σ = 38952295200. Its totient is φ = 9892641920.

The previous prime is 21004203397. The next prime is 21004203413. The reversal of 21004203404 is 40430240012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2203424 + ... + 2212935.

It is an arithmetic number, because the mean of its divisors is an integer number (1623012300).

Almost surely, 2^21004203404 is an apocalyptic number.

It is an amenable number.

21004203404 is a deficient number, since it is larger than the sum of its proper divisors (17948091796).

21004203404 is a wasteful number, since it uses less digits than its factorization.

21004203404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4416433 (or 4416431 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21004203404 its reverse (40430240012), we get a palindrome (61434443416).

The spelling of 21004203404 in words is "twenty-one billion, four million, two hundred three thousand, four hundred four".