211131223211 has 2 divisors, whose sum is σ = 211131223212. Its totient is φ = 211131223210.

The previous prime is 211131223183. The next prime is 211131223241. The reversal of 211131223211 is 112322131112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211131223211 is a prime.

It is not a weakly prime, because it can be changed into another prime (211131223241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105565611605 + 105565611606.

It is an arithmetic number, because the mean of its divisors is an integer number (105565611606).

Almost surely, 2^211131223211 is an apocalyptic number.

211131223211 is a deficient number, since it is larger than the sum of its proper divisors (1).

211131223211 is an equidigital number, since it uses as much as digits as its factorization.

211131223211 is an evil number, because the sum of its binary digits is even.

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

Adding to 211131223211 its reverse (112322131112), we get a palindrome (323453354323).

The spelling of 211131223211 in words is "two hundred eleven billion, one hundred thirty-one million, two hundred twenty-three thousand, two hundred eleven".