211131220323 has 4 divisors (see below), whose sum is σ = 281508293768. Its totient is φ = 140754146880.

The previous prime is 211131220273. The next prime is 211131220331. The reversal of 211131220323 is 323022131112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 211131220323 - 2⁶ = 211131220259 is a prime.

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 211131220323.

It is not an unprimeable number, because it can be changed into a prime (211131225323) 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, 35188536718 + ... + 35188536723.

It is an arithmetic number, because the mean of its divisors is an integer number (70377073442).

Almost surely, 2^211131220323 is an apocalyptic number.

211131220323 is a deficient number, since it is larger than the sum of its proper divisors (70377073445).

211131220323 is an equidigital number, since it uses as much as digits as its factorization.

211131220323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70377073444.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 211131220323 its reverse (323022131112), we get a palindrome (534153351435).

The spelling of 211131220323 in words is "two hundred eleven billion, one hundred thirty-one million, two hundred twenty thousand, three hundred twenty-three".