21022004104 has 16 divisors (see below), whose sum is σ = 39428513100. Its totient is φ = 10507733952.

The previous prime is 21022004099. The next prime is 21022004119. The reversal of 21022004104 is 40140022012.

It can be written as a sum of positive squares in 2 ways, for example, as 20908581604 + 113422500 = 144598^2 + 10650^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381067 + ... + 432730.

Almost surely, 2^21022004104 is an apocalyptic number.

It is an amenable number.

21022004104 is a deficient number, since it is larger than the sum of its proper divisors (18406508996).

21022004104 is a wasteful number, since it uses less digits than its factorization.

21022004104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817032 (or 817028 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21022004104 its reverse (40140022012), we get a palindrome (61162026116).

The spelling of 21022004104 in words is "twenty-one billion, twenty-two million, four thousand, one hundred four".