211806189799 has 4 divisors (see below), whose sum is σ = 213989758864. Its totient is φ = 209622620736.

The previous prime is 211806189797. The next prime is 211806189841. The reversal of 211806189799 is 997981608112.

211806189799 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 a cyclic number.

It is not a de Polignac number, because 211806189799 - 2¹ = 211806189797 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 (211806189797) 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, 1091784387 + ... + 1091784580.

It is an arithmetic number, because the mean of its divisors is an integer number (53497439716).

Almost surely, 2^211806189799 is an apocalyptic number.

211806189799 is a deficient number, since it is larger than the sum of its proper divisors (2183569065).

211806189799 is an equidigital number, since it uses as much as digits as its factorization.

211806189799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183569064.

The product of its (nonzero) digits is 3919104, while the sum is 61.

The spelling of 211806189799 in words is "two hundred eleven billion, eight hundred six million, one hundred eighty-nine thousand, seven hundred ninety-nine".