12721962369796 has 81 divisors (see below), whose sum is σ = 22910171762037. Its totient is φ = 6181382809440.

The previous prime is 12721962369749. The next prime is 12721962369899. The reversal of 12721962369796 is 69796326912721.

The square root of 12721962369796 is 3566786.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 140185843396 + 12581776526400 = 374414^2 + 3547080^2 .

It is a Duffinian number.

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 26 ways as a sum of consecutive naturals, for example, 70287084826 + ... + 70287085006.

Almost surely, 2^{12721962369796} is an apocalyptic number.

12721962369796 is the 3566786-th square number.

It is an amenable number.

12721962369796 is a deficient number, since it is larger than the sum of its proper divisors (10188209392241).

12721962369796 is an frugal number, since it uses more digits than its factorization.

12721962369796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818 (or 409 counting only the distinct ones).

The product of its digits is 185177664, while the sum is 70.

The spelling of 12721962369796 in words is "twelve trillion, seven hundred twenty-one billion, nine hundred sixty-two million, three hundred sixty-nine thousand, seven hundred ninety-six".