201231023112 has 128 divisors (see below), whose sum is σ = 641502720000. Its totient is φ = 57253912128.

The previous prime is 201231023111. The next prime is 201231023159. The reversal of 201231023112 is 211320132102.

201231023112 is a `hidden beast` number, since 201 + 231 + 0 + 231 + 1 + 2 = 666.

201231023112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (201231023111) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 82939 + ... + 639797.

It is an arithmetic number, because the mean of its divisors is an integer number (5011740000).

Almost surely, 2^201231023112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201231023112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320751360000).

201231023112 is an abundant number, since it is smaller than the sum of its proper divisors (440271696888).

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

201231023112 is a wasteful number, since it uses less digits than its factorization.

201231023112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557120 (or 557110 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 201231023112 its reverse (211320132102), we get a palindrome (412551155214).

The spelling of 201231023112 in words is "two hundred one billion, two hundred thirty-one million, twenty-three thousand, one hundred twelve".