211223212311 has 4 divisors (see below), whose sum is σ = 281630949752. Its totient is φ = 140815474872.

The previous prime is 211223212273. The next prime is 211223212313. The reversal of 211223212311 is 113212322112.

211223212311 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 not a de Polignac number, because 211223212311 - 2⁹ = 211223211799 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 (211223212313) 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, 35203868716 + ... + 35203868721.

It is an arithmetic number, because the mean of its divisors is an integer number (70407737438).

Almost surely, 2^211223212311 is an apocalyptic number.

211223212311 is a deficient number, since it is larger than the sum of its proper divisors (70407737441).

211223212311 is an equidigital number, since it uses as much as digits as its factorization.

211223212311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70407737440.

The product of its digits is 288, while the sum is 21.

Adding to 211223212311 its reverse (113212322112), we get a palindrome (324435534423).

The spelling of 211223212311 in words is "two hundred eleven billion, two hundred twenty-three million, two hundred twelve thousand, three hundred eleven".