12743234721 has 12 divisors (see below), whose sum is σ = 21036451072. Its totient is φ = 7281848376.

The previous prime is 12743234719. The next prime is 12743234729.

12743234721 is a `hidden beast` number, since 1 + 274 + 323 + 47 + 21 = 666.

12743234721 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12743234721 - 2¹ = 12743234719 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12743234729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101136721 + ... + 101136846.

Almost surely, 2^12743234721 is an apocalyptic number.

It is an amenable number.

12743234721 is a deficient number, since it is larger than the sum of its proper divisors (8293216351).

12743234721 is a wasteful number, since it uses less digits than its factorization.

12743234721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202273580 (or 202273577 counting only the distinct ones).

The product of its digits is 56448, while the sum is 36.

The spelling of 12743234721 in words is "twelve billion, seven hundred forty-three million, two hundred thirty-four thousand, seven hundred twenty-one".