1231112020018 has 16 divisors (see below), whose sum is σ = 1936739471040. Its totient is φ = 585803905456.

The previous prime is 1231112020013. The next prime is 1231112020027. The reversal of 1231112020018 is 8100202111321.

It is not an unprimeable number, because it can be changed into a prime (1231112020013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67918108 + ... + 67936231.

It is an arithmetic number, because the mean of its divisors is an integer number (121046216940).

Almost surely, 2^{1231112020018} is an apocalyptic number.

1231112020018 is a deficient number, since it is larger than the sum of its proper divisors (705627451022).

1231112020018 is a wasteful number, since it uses less digits than its factorization.

1231112020018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135854561.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 1231112020018 its reverse (8100202111321), we get a palindrome (9331314131339).

The spelling of 1231112020018 in words is "one trillion, two hundred thirty-one billion, one hundred twelve million, twenty thousand, eighteen".