213122220317 has 2 divisors, whose sum is σ = 213122220318. Its totient is φ = 213122220316.

The previous prime is 213122220307. The next prime is 213122220359. The reversal of 213122220317 is 713022221312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165572492836 + 47549727481 = 406906^2 + 218059^2 .

It is a cyclic number.

It is not a de Polignac number, because 213122220317 - 2¹² = 213122216221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213122220307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106561110158 + 106561110159.

It is an arithmetic number, because the mean of its divisors is an integer number (106561110159).

Almost surely, 2^213122220317 is an apocalyptic number.

It is an amenable number.

213122220317 is a deficient number, since it is larger than the sum of its proper divisors (1).

213122220317 is an equidigital number, since it uses as much as digits as its factorization.

213122220317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 213122220317 its reverse (713022221312), we get a palindrome (926144441629).

The spelling of 213122220317 in words is "two hundred thirteen billion, one hundred twenty-two million, two hundred twenty thousand, three hundred seventeen".