212012111111 has 4 divisors (see below), whose sum is σ = 214695808800. Its totient is φ = 209328413424.

The previous prime is 212012111081. The next prime is 212012111177. The reversal of 212012111111 is 111111210212.

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

It is a cyclic number.

It is not a de Polignac number, because 212012111111 - 2¹⁴ = 212012094727 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 (212012111711) by changing a digit.

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, 1341848726 + ... + 1341848883.

It is an arithmetic number, because the mean of its divisors is an integer number (53673952200).

Almost surely, 2^212012111111 is an apocalyptic number.

212012111111 is a deficient number, since it is larger than the sum of its proper divisors (2683697689).

212012111111 is an equidigital number, since it uses as much as digits as its factorization.

212012111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683697688.

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

Adding to 212012111111 its reverse (111111210212), we get a palindrome (323123321323).

It can be divided in two parts, 21201 and 2111111, that added together give a palindrome (2132312).

The spelling of 212012111111 in words is "two hundred twelve billion, twelve million, one hundred eleven thousand, one hundred eleven".