211118816423 has 4 divisors (see below), whose sum is σ = 218398775640. Its totient is φ = 203838857208.

The previous prime is 211118816341. The next prime is 211118816429. The reversal of 211118816423 is 324618811112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211118816423 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 (211118816429) 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, 3639979565 + ... + 3639979622.

It is an arithmetic number, because the mean of its divisors is an integer number (54599693910).

Almost surely, 2^211118816423 is an apocalyptic number.

211118816423 is a deficient number, since it is larger than the sum of its proper divisors (7279959217).

211118816423 is an equidigital number, since it uses as much as digits as its factorization.

211118816423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7279959216.

The product of its digits is 18432, while the sum is 38.

The spelling of 211118816423 in words is "two hundred eleven billion, one hundred eighteen million, eight hundred sixteen thousand, four hundred twenty-three".