12118878981 has 24 divisors (see below), whose sum is σ = 19100038464. Its totient is φ = 7343381760.

The previous prime is 12118878979. The next prime is 12118879039. The reversal of 12118878981 is 18987881121.

12118878981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12118878981 - 2¹ = 12118878979 is a prime.

It is a super-2 number, since 2×12118878981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12118878901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 793045 + ... + 808181.

It is an arithmetic number, because the mean of its divisors is an integer number (795834936).

Almost surely, 2^12118878981 is an apocalyptic number.

12118878981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12118878981 is a deficient number, since it is larger than the sum of its proper divisors (6981159483).

12118878981 is a wasteful number, since it uses less digits than its factorization.

12118878981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23241 (or 23238 counting only the distinct ones).

The product of its digits is 516096, while the sum is 54.

The spelling of 12118878981 in words is "twelve billion, one hundred eighteen million, eight hundred seventy-eight thousand, nine hundred eighty-one".