217442211211 has 2 divisors, whose sum is σ = 217442211212. Its totient is φ = 217442211210.

The previous prime is 217442211097. The next prime is 217442211221. The reversal of 217442211211 is 112112244712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217442211211 - 2¹¹ = 217442209163 is a prime.

It is a super-2 number, since 2×217442211211² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 217442211211.

It is not a weakly prime, because it can be changed into another prime (217442211221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108721105605 + 108721105606.

It is an arithmetic number, because the mean of its divisors is an integer number (108721105606).

Almost surely, 2^217442211211 is an apocalyptic number.

217442211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

217442211211 is an equidigital number, since it uses as much as digits as its factorization.

217442211211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 28.

Adding to 217442211211 its reverse (112112244712), we get a palindrome (329554455923).

The spelling of 217442211211 in words is "two hundred seventeen billion, four hundred forty-two million, two hundred eleven thousand, two hundred eleven".