212135173 has 2 divisors, whose sum is σ = 212135174. Its totient is φ = 212135172.

The previous prime is 212135167. The next prime is 212135177. The reversal of 212135173 is 371531212.

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., 211935364 + 199809 = 14558^2 + 447^2 .

It is a cyclic number.

It is not a de Polignac number, because 212135173 - 2¹⁷ = 212004101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212135177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106067586 + 106067587.

It is an arithmetic number, because the mean of its divisors is an integer number (106067587).

Almost surely, 2^212135173 is an apocalyptic number.

It is an amenable number.

212135173 is a deficient number, since it is larger than the sum of its proper divisors (1).

212135173 is an equidigital number, since it uses as much as digits as its factorization.

212135173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 25.

The square root of 212135173 is about 14564.8608987522. The cubic root of 212135173 is about 596.3998984667.

Adding to 212135173 its reverse (371531212), we get a palindrome (583666385).

The spelling of 212135173 in words is "two hundred twelve million, one hundred thirty-five thousand, one hundred seventy-three".