12720423727 has 4 divisors (see below), whose sum is σ = 13876825896. Its totient is φ = 11564021560.

The previous prime is 12720423721. The next prime is 12720423739. The reversal of 12720423727 is 72732402721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72732402721 = 11 ⋅6612036611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12720423727 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 (12720423721) 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, 578201068 + ... + 578201089.

It is an arithmetic number, because the mean of its divisors is an integer number (3469206474).

Almost surely, 2^12720423727 is an apocalyptic number.

12720423727 is a deficient number, since it is larger than the sum of its proper divisors (1156402169).

12720423727 is a wasteful number, since it uses less digits than its factorization.

12720423727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156402168.

The product of its (nonzero) digits is 65856, while the sum is 37.

The spelling of 12720423727 in words is "twelve billion, seven hundred twenty million, four hundred twenty-three thousand, seven hundred twenty-seven".