212201891173 has 2 divisors, whose sum is σ = 212201891174. Its totient is φ = 212201891172.

The previous prime is 212201891149. The next prime is 212201891189. The reversal of 212201891173 is 371198102212.

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., 204830466724 + 7371424449 = 452582^2 + 85857^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212201891173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212201891113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106100945586 + 106100945587.

It is an arithmetic number, because the mean of its divisors is an integer number (106100945587).

Almost surely, 2^212201891173 is an apocalyptic number.

It is an amenable number.

212201891173 is a deficient number, since it is larger than the sum of its proper divisors (1).

212201891173 is an equidigital number, since it uses as much as digits as its factorization.

212201891173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

Adding to 212201891173 its reverse (371198102212), we get a palindrome (583399993385).

The spelling of 212201891173 in words is "two hundred twelve billion, two hundred one million, eight hundred ninety-one thousand, one hundred seventy-three".