1211111211112 has 64 divisors (see below), whose sum is σ = 2544322959360. Its totient is φ = 535675238400.

The previous prime is 1211111211109. The next prime is 1211111211139. The reversal of 1211111211112 is 2111121111121.

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 unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 943648 + ... + 1820080.

It is an arithmetic number, because the mean of its divisors is an integer number (39755046240).

Almost surely, 2^{1211111211112} 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 1211111211112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1272161479680).

1211111211112 is an abundant number, since it is smaller than the sum of its proper divisors (1333211748248).

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

1211111211112 is a wasteful number, since it uses less digits than its factorization.

1211111211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876874 (or 876870 counting only the distinct ones).

The product of its digits is 8, while the sum is 16.

Adding to 1211111211112 its reverse (2111121111121), we get a palindrome (3322232322233).

Subtracting 1211111211112 from its reverse (2111121111121), we obtain a palindrome (900009900009).

The spelling of 1211111211112 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred eleven thousand, one hundred twelve".