211112011205 has 4 divisors (see below), whose sum is σ = 253334413452. Its totient is φ = 168889608960.

The previous prime is 211112011153. The next prime is 211112011307. The reversal of 211112011205 is 502110211112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58007277409 + 153104733796 = 240847^2 + 391286^2 .

It is a de Polignac number, because none of the positive numbers 2^k-211112011205 is a prime.

It is a Duffinian number.

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, 21111201116 + ... + 21111201125.

It is an arithmetic number, because the mean of its divisors is an integer number (63333603363).

Almost surely, 2^211112011205 is an apocalyptic number.

It is an amenable number.

211112011205 is a deficient number, since it is larger than the sum of its proper divisors (42222402247).

211112011205 is an equidigital number, since it uses as much as digits as its factorization.

211112011205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42222402246.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 211112011205 its reverse (502110211112), we get a palindrome (713222222317).

The spelling of 211112011205 in words is "two hundred eleven billion, one hundred twelve million, eleven thousand, two hundred five".