211443424109 has 4 divisors (see below), whose sum is σ = 223881272604. Its totient is φ = 199005575616.

The previous prime is 211443424103. The next prime is 211443424139. The reversal of 211443424109 is 901424344112.

211443424109 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 can be written as a sum of positive squares in 2 ways, for example, as 71354162884 + 140089261225 = 267122^2 + 374285^2 .

It is a cyclic number.

It is not a de Polignac number, because 211443424109 - 2¹⁶ = 211443358573 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 (211443424103) 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, 6218924222 + ... + 6218924255.

It is an arithmetic number, because the mean of its divisors is an integer number (55970318151).

Almost surely, 2^211443424109 is an apocalyptic number.

It is an amenable number.

211443424109 is a deficient number, since it is larger than the sum of its proper divisors (12437848495).

211443424109 is a wasteful number, since it uses less digits than its factorization.

211443424109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12437848494.

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 211443424109 in words is "two hundred eleven billion, four hundred forty-three million, four hundred twenty-four thousand, one hundred nine".