20131231110012 has 36 divisors (see below), whose sum is σ = 55513394880216. Its totient is φ = 6100373063520.

The previous prime is 20131231109963. The next prime is 20131231110043. The reversal of 20131231110012 is 21001113213102.

20131231110012 is a `hidden beast` number, since 20 + 1 + 312 + 311 + 10 + 0 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25418220703 + ... + 25418221494.

Almost surely, 2^{20131231110012} is an apocalyptic number.

20131231110012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20131231110012 is an abundant number, since it is smaller than the sum of its proper divisors (35382163770204).

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

20131231110012 is a wasteful number, since it uses less digits than its factorization.

20131231110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50836442218 (or 50836442213 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 20131231110012 its reverse (21001113213102), we get a palindrome (41132344323114).

The spelling of 20131231110012 in words is "twenty trillion, one hundred thirty-one billion, two hundred thirty-one million, one hundred ten thousand, twelve".