21204032404 has 12 divisors (see below), whose sum is σ = 37113012244. Its totient is φ = 10600314624.

The previous prime is 21204032401. The next prime is 21204032431. The reversal of 21204032404 is 40423040212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20374707600 + 829324804 = 142740^2 + 28798^2 .

It is a super-2 number, since 2×21204032404² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204032401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397149 + ... + 447364.

Almost surely, 2^21204032404 is an apocalyptic number.

It is an amenable number.

21204032404 is a deficient number, since it is larger than the sum of its proper divisors (15908979840).

21204032404 is a wasteful number, since it uses less digits than its factorization.

21204032404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850794 (or 850792 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21204032404 its reverse (40423040212), we get a palindrome (61627072616).

The spelling of 21204032404 in words is "twenty-one billion, two hundred four million, thirty-two thousand, four hundred four".