11111211112 has 8 divisors (see below), whose sum is σ = 20833520850. Its totient is φ = 5555605552.

The previous prime is 11111211073. The next prime is 11111211121. The reversal of 11111211112 is 21111211111.

It can be written as a sum of positive squares in only one way, i.e., 9309548196 + 1801662916 = 96486^2 + 42446^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 a junction number, because it is equal to n+sod(n) for n = 11111211092 and 11111211101.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694450687 + ... + 694450702.

Almost surely, 2^11111211112 is an apocalyptic number.

It is an amenable number.

11111211112 is a deficient number, since it is larger than the sum of its proper divisors (9722309738).

11111211112 is a wasteful number, since it uses less digits than its factorization.

11111211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388901395 (or 1388901391 counting only the distinct ones).

The product of its digits is 4, while the sum is 13.

Adding to 11111211112 its reverse (21111211111), we get a palindrome (32222422223).

Subtracting 11111211112 from its reverse (21111211111), we obtain a palindrome (9999999999).

It can be divided in two parts, 11111 and 211112, that multiplied together give a palindrome (2345665432).

The spelling of 11111211112 in words is "eleven billion, one hundred eleven million, two hundred eleven thousand, one hundred twelve".