21304032004 has 12 divisors (see below), whose sum is σ = 37985491404. Its totient is φ = 10451034464.

The previous prime is 21304031999. The next prime is 21304032011. The reversal of 21304032004 is 40023040312.

It can be written as a sum of positive squares in 2 ways, for example, as 17840944900 + 3463087104 = 133570^2 + 58848^2 .

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, 50245147 + ... + 50245570.

It is an arithmetic number, because the mean of its divisors is an integer number (3165457617).

Almost surely, 2^21304032004 is an apocalyptic number.

It is an amenable number.

21304032004 is a deficient number, since it is larger than the sum of its proper divisors (16681459400).

21304032004 is a wasteful number, since it uses less digits than its factorization.

21304032004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100490774 (or 100490772 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21304032004 its reverse (40023040312), we get a palindrome (61327072316).

The spelling of 21304032004 in words is "twenty-one billion, three hundred four million, thirty-two thousand, four".