12724921693 has 4 divisors (see below), whose sum is σ = 13881732768. Its totient is φ = 11568110620.

The previous prime is 12724921669. The next prime is 12724921697. The reversal of 12724921693 is 39612942721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12724921693 - 2²⁹ = 12188050781 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 (12724921697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578405521 + ... + 578405542.

It is an arithmetic number, because the mean of its divisors is an integer number (3470433192).

Almost surely, 2^12724921693 is an apocalyptic number.

It is an amenable number.

12724921693 is a deficient number, since it is larger than the sum of its proper divisors (1156811075).

12724921693 is a wasteful number, since it uses less digits than its factorization.

12724921693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156811074.

The product of its digits is 326592, while the sum is 46.

The spelling of 12724921693 in words is "twelve billion, seven hundred twenty-four million, nine hundred twenty-one thousand, six hundred ninety-three".