212221133317 has 2 divisors, whose sum is σ = 212221133318. Its totient is φ = 212221133316.

The previous prime is 212221133303. The next prime is 212221133321. The reversal of 212221133317 is 713331122212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107658796996 + 104562336321 = 328114^2 + 323361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212221133317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212221133347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110566658 + 106110566659.

It is an arithmetic number, because the mean of its divisors is an integer number (106110566659).

Almost surely, 2^212221133317 is an apocalyptic number.

It is an amenable number.

212221133317 is a deficient number, since it is larger than the sum of its proper divisors (1).

212221133317 is an equidigital number, since it uses as much as digits as its factorization.

212221133317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

Adding to 212221133317 its reverse (713331122212), we get a palindrome (925552255529).

The spelling of 212221133317 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred thirty-three thousand, three hundred seventeen".