211955045173 has 2 divisors, whose sum is σ = 211955045174. Its totient is φ = 211955045172.

The previous prime is 211955045153. The next prime is 211955045201. The reversal of 211955045173 is 371540559112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209967401284 + 1987643889 = 458222^2 + 44583^2 .

It is a cyclic number.

It is not a de Polignac number, because 211955045173 - 2²¹ = 211952948021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211955045153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105977522586 + 105977522587.

It is an arithmetic number, because the mean of its divisors is an integer number (105977522587).

Almost surely, 2^211955045173 is an apocalyptic number.

It is an amenable number.

211955045173 is a deficient number, since it is larger than the sum of its proper divisors (1).

211955045173 is an equidigital number, since it uses as much as digits as its factorization.

211955045173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 211955045173 in words is "two hundred eleven billion, nine hundred fifty-five million, forty-five thousand, one hundred seventy-three".