211312123211 has 4 divisors (see below), whose sum is σ = 241499569392. Its totient is φ = 181124677032.

The previous prime is 211312123207. The next prime is 211312123223. The reversal of 211312123211 is 112321213112.

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 211312123211 - 2² = 211312123207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211312123261) 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, 15093723080 + ... + 15093723093.

It is an arithmetic number, because the mean of its divisors is an integer number (60374892348).

Almost surely, 2^211312123211 is an apocalyptic number.

211312123211 is a deficient number, since it is larger than the sum of its proper divisors (30187446181).

211312123211 is an equidigital number, since it uses as much as digits as its factorization.

211312123211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30187446180.

The product of its digits is 144, while the sum is 20.

Adding to 211312123211 its reverse (112321213112), we get a palindrome (323633336323).

The spelling of 211312123211 in words is "two hundred eleven billion, three hundred twelve million, one hundred twenty-three thousand, two hundred eleven".