217212740206 has 16 divisors (see below), whose sum is σ = 406216033920. Its totient is φ = 84628340280.

The previous prime is 217212740183. The next prime is 217212740219. The reversal of 217212740206 is 602047212712.

217212740206 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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, 705236016 + ... + 705236323.

It is an arithmetic number, because the mean of its divisors is an integer number (25388502120).

Almost surely, 2^217212740206 is an apocalyptic number.

217212740206 is a deficient number, since it is larger than the sum of its proper divisors (189003293714).

217212740206 is a wasteful number, since it uses less digits than its factorization.

217212740206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410472359.

The product of its (nonzero) digits is 18816, while the sum is 34.

Adding to 217212740206 its reverse (602047212712), we get a palindrome (819259952918).

The spelling of 217212740206 in words is "two hundred seventeen billion, two hundred twelve million, seven hundred forty thousand, two hundred six".