21004042203304 has 16 divisors (see below), whose sum is σ = 41699201433300. Its totient is φ = 9884255154432.

The previous prime is 21004042203289. The next prime is 21004042203317. The reversal of 21004042203304 is 40330224040012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20158286080804 + 845756122500 = 4489798^2 + 919650^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77220743259 + ... + 77220743530.

Almost surely, 2^{21004042203304} is an apocalyptic number.

It is an amenable number.

21004042203304 is a deficient number, since it is larger than the sum of its proper divisors (20695159229996).

21004042203304 is a wasteful number, since it uses less digits than its factorization.

21004042203304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154441486812 (or 154441486808 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21004042203304 its reverse (40330224040012), we get a palindrome (61334266243316).

The spelling of 21004042203304 in words is "twenty-one trillion, four billion, forty-two million, two hundred three thousand, three hundred four".