12111212122112 has 26 divisors (see below), whose sum is σ = 24219467413518. Its totient is φ = 6055606059008.

The previous prime is 12111212122111. The next prime is 12111212122153. The reversal of 12111212122112 is 21122121211121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6823714226176 + 5287497895936 = 2612224^2 + 2299456^2 .

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an insolite number, because it is divisible by the sum (32) and by the product (4096) of the squares of its digits.

It is not an unprimeable number, because it can be changed into a prime (12111212122111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1478415353 + ... + 1478423544.

It is an arithmetic number, because the mean of its divisors is an integer number (931517977443).

Almost surely, 2^{12111212122112} is an apocalyptic number.

It is an amenable number.

12111212122112 is a deficient number, since it is larger than the sum of its proper divisors (12108255291406).

12111212122112 is an frugal number, since it uses more digits than its factorization.

12111212122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956838921 (or 2956838899 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

Adding to 12111212122112 its reverse (21122121211121), we get a palindrome (33233333333233).

The spelling of 12111212122112 in words is "twelve trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, one hundred twelve".