211212212111 has 4 divisors (see below), whose sum is σ = 220395351792. Its totient is φ = 202029072432.

The previous prime is 211212212089. The next prime is 211212212131. The reversal of 211212212111 is 111212212112.

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 211212212111 - 2³⁰ = 210138470287 is a prime.

It is a super-2 number, since 2×211212212111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211212212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212212131) 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, 4591569806 + ... + 4591569851.

It is an arithmetic number, because the mean of its divisors is an integer number (55098837948).

Almost surely, 2^211212212111 is an apocalyptic number.

211212212111 is a deficient number, since it is larger than the sum of its proper divisors (9183139681).

211212212111 is an equidigital number, since it uses as much as digits as its factorization.

211212212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9183139680.

The product of its digits is 32, while the sum is 17.

Adding to 211212212111 its reverse (111212212112), we get a palindrome (322424424223).

Subtracting from 211212212111 its reverse (111212212112), we obtain a palindrome (99999999999).

The spelling of 211212212111 in words is "two hundred eleven billion, two hundred twelve million, two hundred twelve thousand, one hundred eleven".