211212111211 has 4 divisors (see below), whose sum is σ = 211234402800. Its totient is φ = 211189819624.

The previous prime is 211212111199. The next prime is 211212111217. The reversal of 211212111211 is 112111212112.

211212111211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211212111211 - 2⁷ = 211212111083 is a prime.

It is a super-2 number, since 2×211212111211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211212111217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11131576 + ... + 11150533.

It is an arithmetic number, because the mean of its divisors is an integer number (52808600700).

Almost surely, 2^211212111211 is an apocalyptic number.

211212111211 is a deficient number, since it is larger than the sum of its proper divisors (22291589).

211212111211 is an equidigital number, since it uses as much as digits as its factorization.

211212111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22291588.

The product of its digits is 16, while the sum is 16.

Adding to 211212111211 its reverse (112111212112), we get a palindrome (323323323323).

The spelling of 211212111211 in words is "two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, two hundred eleven".