211111212112 has 20 divisors (see below), whose sum is σ = 409058920116. Its totient is φ = 105547619840.

The previous prime is 211111212079. The next prime is 211111212167. The reversal of 211111212112 is 211212111112.

It can be written as a sum of positive squares in 2 ways, for example, as 15991119936 + 195120092176 = 126456^2 + 441724^2 .

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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278089 + ... + 706792.

Almost surely, 2^211111212112 is an apocalyptic number.

It is an amenable number.

211111212112 is a deficient number, since it is larger than the sum of its proper divisors (197947708004).

211111212112 is a wasteful number, since it uses less digits than its factorization.

211111212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998286 (or 998280 counting only the distinct ones).

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

Adding to 211111212112 its reverse (211212111112), we get a palindrome (422323323224).

The spelling of 211111212112 in words is "two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred twelve".