12120172056 has 24 divisors (see below), whose sum is σ = 32825466180. Its totient is φ = 4040057328.

The previous prime is 12120171997. The next prime is 12120172061. The reversal of 12120172056 is 65027102121.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84167790 + ... + 84167933.

Almost surely, 2^12120172056 is an apocalyptic number.

It is an amenable number.

12120172056 is an abundant number, since it is smaller than the sum of its proper divisors (20705294124).

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

12120172056 is a wasteful number, since it uses less digits than its factorization.

12120172056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168335735 (or 168335728 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 12120172056 its reverse (65027102121), we get a palindrome (77147274177).

The spelling of 12120172056 in words is "twelve billion, one hundred twenty million, one hundred seventy-two thousand, fifty-six".