210211212173 has 2 divisors, whose sum is σ = 210211212174. Its totient is φ = 210211212172.

The previous prime is 210211212143. The next prime is 210211212199. The reversal of 210211212173 is 371212112012.

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., 208481733604 + 1729478569 = 456598^2 + 41587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210211212173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210211212143) 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, 105105606086 + 105105606087.

It is an arithmetic number, because the mean of its divisors is an integer number (105105606087).

Almost surely, 2^210211212173 is an apocalyptic number.

It is an amenable number.

210211212173 is a deficient number, since it is larger than the sum of its proper divisors (1).

210211212173 is an equidigital number, since it uses as much as digits as its factorization.

210211212173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 210211212173 its reverse (371212112012), we get a palindrome (581423324185).

The spelling of 210211212173 in words is "two hundred ten billion, two hundred eleven million, two hundred twelve thousand, one hundred seventy-three".