12351721187 has 16 divisors (see below), whose sum is σ = 13433148960. Its totient is φ = 11289196800.

The previous prime is 12351721183. The next prime is 12351721219. The reversal of 12351721187 is 78112715321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12351721187 - 2² = 12351721183 is a prime.

It is a super-3 number, since 3×12351721187³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12351721187.

It is not an unprimeable number, because it can be changed into a prime (12351721183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3457112 + ... + 3460682.

It is an arithmetic number, because the mean of its divisors is an integer number (839571810).

Almost surely, 2^12351721187 is an apocalyptic number.

12351721187 is a deficient number, since it is larger than the sum of its proper divisors (1081427773).

12351721187 is a wasteful number, since it uses less digits than its factorization.

12351721187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6134.

The product of its digits is 23520, while the sum is 38.

The spelling of 12351721187 in words is "twelve billion, three hundred fifty-one million, seven hundred twenty-one thousand, one hundred eighty-seven".