211211222222173 has 2 divisors, whose sum is σ = 211211222222174. Its totient is φ = 211211222222172.

The previous prime is 211211222222137. The next prime is 211211222222251. The reversal of 211211222222173 is 371222222112112.

Together with previous prime (211211222222137) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138818045359449 + 72393176862724 = 11782107^2 + 8508418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211211222222173 is a prime.

It is a super-2 number, since 2×211211222222173² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211211222222773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605611111086 + 105605611111087.

It is an arithmetic number, because the mean of its divisors is an integer number (105605611111087).

Almost surely, 2^{211211222222173} is an apocalyptic number.

It is an amenable number.

211211222222173 is a deficient number, since it is larger than the sum of its proper divisors (1).

211211222222173 is an equidigital number, since it uses as much as digits as its factorization.

211211222222173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

Adding to 211211222222173 its reverse (371222222112112), we get a palindrome (582433444334285).

The spelling of 211211222222173 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred seventy-three".