212123312173 has 2 divisors, whose sum is σ = 212123312174. Its totient is φ = 212123312172.

The previous prime is 212123312171. The next prime is 212123312201. The reversal of 212123312173 is 371213321212.

It is an a-pointer prime, because the next prime (212123312201) can be obtained adding 212123312173 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134493093289 + 77630218884 = 366733^2 + 278622^2 .

It is a cyclic number.

It is not a de Polignac number, because 212123312173 - 2¹ = 212123312171 is a prime.

Together with 212123312171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212123312171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106061656086 + 106061656087.

It is an arithmetic number, because the mean of its divisors is an integer number (106061656087).

Almost surely, 2^212123312173 is an apocalyptic number.

It is an amenable number.

212123312173 is a deficient number, since it is larger than the sum of its proper divisors (1).

212123312173 is an equidigital number, since it uses as much as digits as its factorization.

212123312173 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 212123312173 its reverse (371213321212), we get a palindrome (583336633385).

The spelling of 212123312173 in words is "two hundred twelve billion, one hundred twenty-three million, three hundred twelve thousand, one hundred seventy-three".