21331244203204 has 12 divisors (see below), whose sum is σ = 40201190998444. Its totient is φ = 9845189632224.

The previous prime is 21331244203189. The next prime is 21331244203207. The reversal of 21331244203204 is 40230244213312.

It can be written as a sum of positive squares in 2 ways, for example, as 1855174754304 + 19476069448900 = 1362048^2 + 4413170^2 .

It is not an unprimeable number, because it can be changed into a prime (21331244203207) 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, 205108117287 + ... + 205108117390.

Almost surely, 2^{21331244203204} is an apocalyptic number.

It is an amenable number.

21331244203204 is a deficient number, since it is larger than the sum of its proper divisors (18869946795240).

21331244203204 is a wasteful number, since it uses less digits than its factorization.

21331244203204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410216234694 (or 410216234692 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 21331244203204 its reverse (40230244213312), we get a palindrome (61561488416516).

The spelling of 21331244203204 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred forty-four million, two hundred three thousand, two hundred four".