12737473721 has 4 divisors (see below), whose sum is σ = 14557112832. Its totient is φ = 10917834612.

The previous prime is 12737473711. The next prime is 12737473741.

12737473721 is nontrivially palindromic in base 10.

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 a cyclic number.

It is not a de Polignac number, because 12737473721 - 2¹⁰ = 12737472697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12737473711) 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, 909819545 + ... + 909819558.

It is an arithmetic number, because the mean of its divisors is an integer number (3639278208).

Almost surely, 2^12737473721 is an apocalyptic number.

It is an amenable number.

12737473721 is a deficient number, since it is larger than the sum of its proper divisors (1819639111).

12737473721 is an equidigital number, since it uses as much as digits as its factorization.

12737473721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819639110.

The product of its digits is 345744, while the sum is 44.

The spelling of 12737473721 in words is "twelve billion, seven hundred thirty-seven million, four hundred seventy-three thousand, seven hundred twenty-one".