12161910912 has 32 divisors (see below), whose sum is σ = 32305076880. Its totient is φ = 4053970176.

The previous prime is 12161910911. The next prime is 12161910923. The reversal of 12161910912 is 21901916121.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (12161910911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15835438 + ... + 15836205.

Almost surely, 2^12161910912 is an apocalyptic number.

12161910912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12161910912 is an abundant number, since it is smaller than the sum of its proper divisors (20143165968).

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

12161910912 is an equidigital number, since it uses as much as digits as its factorization.

12161910912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31671660 (or 31671648 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 33.

The spelling of 12161910912 in words is "twelve billion, one hundred sixty-one million, nine hundred ten thousand, nine hundred twelve".