211313331217 has 2 divisors, whose sum is σ = 211313331218. Its totient is φ = 211313331216.

The previous prime is 211313331209. The next prime is 211313331233. The reversal of 211313331217 is 712133313112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210863721601 + 449609616 = 459199^2 + 21204^2 .

It is a cyclic number.

It is not a de Polignac number, because 211313331217 - 2³ = 211313331209 is a prime.

It is not a weakly prime, because it can be changed into another prime (211313331517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105656665608 + 105656665609.

It is an arithmetic number, because the mean of its divisors is an integer number (105656665609).

Almost surely, 2^211313331217 is an apocalyptic number.

It is an amenable number.

211313331217 is a deficient number, since it is larger than the sum of its proper divisors (1).

211313331217 is an equidigital number, since it uses as much as digits as its factorization.

211313331217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 28.

Adding to 211313331217 its reverse (712133313112), we get a palindrome (923446644329).

The spelling of 211313331217 in words is "two hundred eleven billion, three hundred thirteen million, three hundred thirty-one thousand, two hundred seventeen".