12381720279 has 32 divisors (see below), whose sum is σ = 17927516160. Its totient is φ = 7571461632.

The previous prime is 12381720271. The next prime is 12381720343. The reversal of 12381720279 is 97202718321.

It is not a de Polignac number, because 12381720279 - 2³ = 12381720271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12381720279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381720271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 562077 + ... + 583689.

It is an arithmetic number, because the mean of its divisors is an integer number (560234880).

Almost surely, 2^12381720279 is an apocalyptic number.

12381720279 is a deficient number, since it is larger than the sum of its proper divisors (5545795881).

12381720279 is a wasteful number, since it uses less digits than its factorization.

12381720279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21919.

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 12381720279 in words is "twelve billion, three hundred eighty-one million, seven hundred twenty thousand, two hundred seventy-nine".