21313344512 has 22 divisors (see below), whose sum is σ = 42605877258. Its totient is φ = 10656671744.

The previous prime is 21313344491. The next prime is 21313344517. The reversal of 21313344512 is 21544331312.

It can be written as a sum of positive squares in only one way, i.e., 11300540416 + 10012804096 = 106304^2 + 100064^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313344517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10405883 + ... + 10407930.

Almost surely, 2^21313344512 is an apocalyptic number.

It is an amenable number.

21313344512 is a deficient number, since it is larger than the sum of its proper divisors (21292532746).

21313344512 is an equidigital number, since it uses as much as digits as its factorization.

21313344512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20813833 (or 20813815 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

Adding to 21313344512 its reverse (21544331312), we get a palindrome (42857675824).

The spelling of 21313344512 in words is "twenty-one billion, three hundred thirteen million, three hundred forty-four thousand, five hundred twelve".