12921733399 has 4 divisors (see below), whose sum is σ = 13036085136. Its totient is φ = 12807381664.

The previous prime is 12921733373. The next prime is 12921733403. The reversal of 12921733399 is 99333712921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99333712921 = 43 ⋅2310086347.

It is a cyclic number.

It is not a de Polignac number, because 12921733399 - 2⁵ = 12921733367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921730399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57175699 + ... + 57175924.

It is an arithmetic number, because the mean of its divisors is an integer number (3259021284).

Almost surely, 2^12921733399 is an apocalyptic number.

12921733399 is a deficient number, since it is larger than the sum of its proper divisors (114351737).

12921733399 is a wasteful number, since it uses less digits than its factorization.

12921733399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114351736.

The product of its digits is 551124, while the sum is 49.

The spelling of 12921733399 in words is "twelve billion, nine hundred twenty-one million, seven hundred thirty-three thousand, three hundred ninety-nine".