20131123112 has 16 divisors (see below), whose sum is σ = 37749534900. Its totient is φ = 10064580480.

The previous prime is 20131123109. The next prime is 20131123147. The reversal of 20131123112 is 21132113102.

It can be written as a sum of positive squares in 2 ways, for example, as 19721708356 + 409414756 = 140434^2 + 20234^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31439 + ... + 203102.

Almost surely, 2^20131123112 is an apocalyptic number.

It is an amenable number.

20131123112 is a deficient number, since it is larger than the sum of its proper divisors (17618411788).

20131123112 is a wasteful number, since it uses less digits than its factorization.

20131123112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245276 (or 245272 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20131123112 its reverse (21132113102), we get a palindrome (41263236214).

The spelling of 20131123112 in words is "twenty billion, one hundred thirty-one million, one hundred twenty-three thousand, one hundred twelve".