203440812217 has 8 divisors (see below), whose sum is σ = 217628620776. Its totient is φ = 189499748352.

The previous prime is 203440812139. The next prime is 203440812301. The reversal of 203440812217 is 712218044302.

203440812217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 33683627961 + 169757184256 = 183531^2 + 412016^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 203440812217 - 2²⁷ = 203306594489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203440852217) 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 7 ways as a sum of consecutive naturals, for example, 61684468 + ... + 61687765.

It is an arithmetic number, because the mean of its divisors is an integer number (27203577597).

Almost surely, 2^203440812217 is an apocalyptic number.

It is an amenable number.

203440812217 is a deficient number, since it is larger than the sum of its proper divisors (14187808559).

203440812217 is a wasteful number, since it uses less digits than its factorization.

203440812217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123372347.

The product of its (nonzero) digits is 21504, while the sum is 34.

Adding to 203440812217 its reverse (712218044302), we get a palindrome (915658856519).

The spelling of 203440812217 in words is "two hundred three billion, four hundred forty million, eight hundred twelve thousand, two hundred seventeen".