12721652867 has 24 divisors (see below), whose sum is σ = 15993464928. Its totient is φ = 9905195520.

The previous prime is 12721652851. The next prime is 12721652893. The reversal of 12721652867 is 76825612721.

It is not a de Polignac number, because 12721652867 - 2⁴ = 12721652851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12721652837) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1225523 + ... + 1235859.

It is an arithmetic number, because the mean of its divisors is an integer number (666394372).

Almost surely, 2^12721652867 is an apocalyptic number.

12721652867 is a deficient number, since it is larger than the sum of its proper divisors (3271812061).

12721652867 is a wasteful number, since it uses less digits than its factorization.

12721652867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11819 (or 11808 counting only the distinct ones).

The product of its digits is 564480, while the sum is 47.

The spelling of 12721652867 in words is "twelve billion, seven hundred twenty-one million, six hundred fifty-two thousand, eight hundred sixty-seven".