212011121111 has 4 divisors (see below), whose sum is σ = 214110241224. Its totient is φ = 209912001000.

The previous prime is 212011121093. The next prime is 212011121143. The reversal of 212011121111 is 111121110212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212011121111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049559905 + ... + 1049560106.

It is an arithmetic number, because the mean of its divisors is an integer number (53527560306).

Almost surely, 2^212011121111 is an apocalyptic number.

212011121111 is a deficient number, since it is larger than the sum of its proper divisors (2099120113).

212011121111 is a wasteful number, since it uses less digits than its factorization.

212011121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099120112.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 212011121111 its reverse (111121110212), we get a palindrome (323132231323).

The spelling of 212011121111 in words is "two hundred twelve billion, eleven million, one hundred twenty-one thousand, one hundred eleven".