212201891189 has 2 divisors, whose sum is σ = 212201891190. Its totient is φ = 212201891188.

The previous prime is 212201891173. The next prime is 212201891227. The reversal of 212201891189 is 981198102212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130297175089 + 81904716100 = 360967^2 + 286190^2 .

It is a cyclic number.

It is not a de Polignac number, because 212201891189 - 2⁴ = 212201891173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212201891149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106100945594 + 106100945595.

It is an arithmetic number, because the mean of its divisors is an integer number (106100945595).

Almost surely, 2^212201891189 is an apocalyptic number.

It is an amenable number.

212201891189 is a deficient number, since it is larger than the sum of its proper divisors (1).

212201891189 is an equidigital number, since it uses as much as digits as its factorization.

212201891189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 44.

The spelling of 212201891189 in words is "two hundred twelve billion, two hundred one million, eight hundred ninety-one thousand, one hundred eighty-nine".