12921724168 has 16 divisors (see below), whose sum is σ = 24500461500. Its totient is φ = 6388267776.

The previous prime is 12921724129. The next prime is 12921724171. The reversal of 12921724168 is 86142712921.

It can be written as a sum of positive squares in 2 ways, for example, as 9564448804 + 3357275364 = 97798^2 + 57942^2 .

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, 9073533 + ... + 9074956.

Almost surely, 2^12921724168 is an apocalyptic number.

It is an amenable number.

12921724168 is a deficient number, since it is larger than the sum of its proper divisors (11578737332).

12921724168 is a wasteful number, since it uses less digits than its factorization.

12921724168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18148584 (or 18148580 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The spelling of 12921724168 in words is "twelve billion, nine hundred twenty-one million, seven hundred twenty-four thousand, one hundred sixty-eight".