113212121112 has 96 divisors (see below), whose sum is σ = 325403704080. Its totient is φ = 35435335680.

The previous prime is 113212121111. The next prime is 113212121153. The reversal of 113212121112 is 211121212311.

It is a happy number.

It is a super-2 number, since 2×113212121112² (a number of 23 digits) contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113212121111) 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, 423187 + ... + 636797.

Almost surely, 2^113212121112 is an apocalyptic number.

113212121112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 113212121112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162701852040).

113212121112 is an abundant number, since it is smaller than the sum of its proper divisors (212191582968).

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

113212121112 is a wasteful number, since it uses less digits than its factorization.

113212121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214073 (or 214066 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 113212121112 its reverse (211121212311), we get a palindrome (324333333423).

The spelling of 113212121112 in words is "one hundred thirteen billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twelve".