12171296512 has 36 divisors (see below), whose sum is σ = 24753473640. Its totient is φ = 5970818048.

The previous prime is 12171296509. The next prime is 12171296521. The reversal of 12171296512 is 21569217121.

It is a super-2 number, since 2×12171296512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434962 + ... + 462097.

It is an arithmetic number, because the mean of its divisors is an integer number (687596490).

Almost surely, 2^12171296512 is an apocalyptic number.

It is an amenable number.

12171296512 is an abundant number, since it is smaller than the sum of its proper divisors (12582177128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12171296512 is an frugal number, since it uses more digits than its factorization.

12171296512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897128 (or 897114 counting only the distinct ones).

The product of its digits is 15120, while the sum is 37.

The spelling of 12171296512 in words is "twelve billion, one hundred seventy-one million, two hundred ninety-six thousand, five hundred twelve".