20131220230112 has 144 divisors (see below), whose sum is σ = 42001870377600. Its totient is φ = 9496527955200.

The previous prime is 20131220230111. The next prime is 20131220230157. The reversal of 20131220230112 is 21103202213102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131220230111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3562414487 + ... + 3562420137.

It is an arithmetic number, because the mean of its divisors is an integer number (291679655400).

Almost surely, 2^{20131220230112} 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 20131220230112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21000935188800).

20131220230112 is an abundant number, since it is smaller than the sum of its proper divisors (21870650147488).

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

20131220230112 is a wasteful number, since it uses less digits than its factorization.

20131220230112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6917 (or 6890 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20131220230112 its reverse (21103202213102), we get a palindrome (41234422443214).

The spelling of 20131220230112 in words is "twenty trillion, one hundred thirty-one billion, two hundred twenty million, two hundred thirty thousand, one hundred twelve".