212101211111 has 4 divisors (see below), whose sum is σ = 217274411424. Its totient is φ = 206928010800.

The previous prime is 212101211099. The next prime is 212101211131. The reversal of 212101211111 is 111112101212.

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 212101211111 - 2³⁰ = 211027469287 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 (212101211131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2586600095 + ... + 2586600176.

It is an arithmetic number, because the mean of its divisors is an integer number (54318602856).

Almost surely, 2^212101211111 is an apocalyptic number.

212101211111 is a deficient number, since it is larger than the sum of its proper divisors (5173200313).

212101211111 is an equidigital number, since it uses as much as digits as its factorization.

212101211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5173200312.

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

Adding to 212101211111 its reverse (111112101212), we get a palindrome (323213312323).

It can be divided in two parts, 21210 and 1211111, that added together give a palindrome (1232321).

The spelling of 212101211111 in words is "two hundred twelve billion, one hundred one million, two hundred eleven thousand, one hundred eleven".