213213111217 has 2 divisors, whose sum is σ = 213213111218. Its totient is φ = 213213111216.

The previous prime is 213213111197. The next prime is 213213111227. The reversal of 213213111217 is 712111312312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169230213376 + 43982897841 = 411376^2 + 209721^2 .

It is a cyclic number.

It is not a de Polignac number, because 213213111217 - 2¹⁹ = 213212586929 is a prime.

It is a super-2 number, since 2×213213111217² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213213111191 and 213213111200.

It is not a weakly prime, because it can be changed into another prime (213213111227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106606555608 + 106606555609.

It is an arithmetic number, because the mean of its divisors is an integer number (106606555609).

Almost surely, 2^213213111217 is an apocalyptic number.

It is an amenable number.

213213111217 is a deficient number, since it is larger than the sum of its proper divisors (1).

213213111217 is an equidigital number, since it uses as much as digits as its factorization.

213213111217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 25.

Adding to 213213111217 its reverse (712111312312), we get a palindrome (925324423529).

The spelling of 213213111217 in words is "two hundred thirteen billion, two hundred thirteen million, one hundred eleven thousand, two hundred seventeen".