12138191870 has 32 divisors (see below), whose sum is σ = 24987045888. Its totient is φ = 4158823968.

The previous prime is 12138191867. The next prime is 12138191893. The reversal of 12138191870 is 7819183121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45347 + ... + 162273.

It is an arithmetic number, because the mean of its divisors is an integer number (780845184).

Almost surely, 2^12138191870 is an apocalyptic number.

12138191870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12138191870 is an abundant number, since it is smaller than the sum of its proper divisors (12848854018).

12138191870 is a wasteful number, since it uses less digits than its factorization.

12138191870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118424.

The product of its (nonzero) digits is 24192, while the sum is 41.

The spelling of 12138191870 in words is "twelve billion, one hundred thirty-eight million, one hundred ninety-one thousand, eight hundred seventy".