212343217 has 2 divisors, whose sum is σ = 212343218. Its totient is φ = 212343216.

The previous prime is 212343169. The next prime is 212343233. The reversal of 212343217 is 712343212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109746576 + 102596641 = 10476^2 + 10129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212343217 is a prime.

It is a super-3 number, since 3×212343217³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212343191 and 212343200.

It is not a weakly prime, because it can be changed into another prime (212343247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106171608 + 106171609.

It is an arithmetic number, because the mean of its divisors is an integer number (106171609).

Almost surely, 2^212343217 is an apocalyptic number.

It is an amenable number.

212343217 is a deficient number, since it is larger than the sum of its proper divisors (1).

212343217 is an equidigital number, since it uses as much as digits as its factorization.

212343217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 212343217 is about 14572.0011323085. The cubic root of 212343217 is about 596.5948007379.

Adding to 212343217 its reverse (712343212), we get a palindrome (924686429).

The spelling of 212343217 in words is "two hundred twelve million, three hundred forty-three thousand, two hundred seventeen".