12121121112 has 16 divisors (see below), whose sum is σ = 30302802840. Its totient is φ = 4040373696.

The previous prime is 12121121087. The next prime is 12121121113. The reversal of 12121121112 is 21112112121.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 12121121091 and 12121121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121121113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252523333 + ... + 252523380.

Almost surely, 2^12121121112 is an apocalyptic number.

12121121112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12121121112 is an abundant number, since it is smaller than the sum of its proper divisors (18181681728).

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

12121121112 is a wasteful number, since it uses less digits than its factorization.

12121121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505046722 (or 505046718 counting only the distinct ones).

The product of its digits is 16, while the sum is 15.

Adding to 12121121112 its reverse (21112112121), we get a palindrome (33233233233).

The spelling of 12121121112 in words is "twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twelve".