1211111112112 has 40 divisors (see below), whose sum is σ = 2572712121600. Its totient is φ = 547738678080.

The previous prime is 1211111112019. The next prime is 1211111112131. The reversal of 1211111112112 is 2112111111121.

It is a Harshad number since it is a multiple of its sum of digits (16).

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 7 ways as a sum of consecutive naturals, for example, 17254708 + ... + 17324755.

It is an arithmetic number, because the mean of its divisors is an integer number (64317803040).

Almost surely, 2^{1211111112112} is an apocalyptic number.

It is an amenable number.

1211111112112 is an abundant number, since it is smaller than the sum of its proper divisors (1361601009488).

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

1211111112112 is a wasteful number, since it uses less digits than its factorization.

1211111112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34579681 (or 34579675 counting only the distinct ones).

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

Adding to 1211111112112 its reverse (2112111111121), we get a palindrome (3323222223233).

Subtracting 1211111112112 from its reverse (2112111111121), we obtain a palindrome (900999999009).

The spelling of 1211111112112 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred twelve thousand, one hundred twelve".