21404443204 has 12 divisors (see below), whose sum is σ = 37466438800. Its totient is φ = 10699746408.

The previous prime is 21404443199. The next prime is 21404443253. The reversal of 21404443204 is 40234440412.

It is a super-3 number, since 3×21404443204³ (a number of 32 digits) contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 599274 + ... + 633985.

Almost surely, 2^21404443204 is an apocalyptic number.

It is an amenable number.

21404443204 is a deficient number, since it is larger than the sum of its proper divisors (16061995596).

21404443204 is a wasteful number, since it uses less digits than its factorization.

21404443204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237602 (or 1237600 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21404443204 its reverse (40234440412), we get a palindrome (61638883616).

The spelling of 21404443204 in words is "twenty-one billion, four hundred four million, four hundred forty-three thousand, two hundred four".