212122111211 has 4 divisors (see below), whose sum is σ = 219436666800. Its totient is φ = 204807555624.

The previous prime is 212122111181. The next prime is 212122111213. The reversal of 212122111211 is 112111221212.

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-212122111211 is a prime.

It is a super-2 number, since 2×212122111211² (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 212122111211.

It is not an unprimeable number, because it can be changed into a prime (212122111213) 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, 3657277751 + ... + 3657277808.

It is an arithmetic number, because the mean of its divisors is an integer number (54859166700).

Almost surely, 2^212122111211 is an apocalyptic number.

212122111211 is a deficient number, since it is larger than the sum of its proper divisors (7314555589).

212122111211 is an equidigital number, since it uses as much as digits as its factorization.

212122111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7314555588.

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

Adding to 212122111211 its reverse (112111221212), we get a palindrome (324233332423).

The spelling of 212122111211 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred eleven thousand, two hundred eleven".