213213333173 has 2 divisors, whose sum is σ = 213213333174. Its totient is φ = 213213333172.

The previous prime is 213213333169. The next prime is 213213333191. The reversal of 213213333173 is 371333312312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118891867249 + 94321465924 = 344807^2 + 307118^2 .

It is a cyclic number.

It is not a de Polignac number, because 213213333173 - 2² = 213213333169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213213332173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106606666586 + 106606666587.

It is an arithmetic number, because the mean of its divisors is an integer number (106606666587).

Almost surely, 2^213213333173 is an apocalyptic number.

It is an amenable number.

213213333173 is a deficient number, since it is larger than the sum of its proper divisors (1).

213213333173 is an equidigital number, since it uses as much as digits as its factorization.

213213333173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 32.

Adding to 213213333173 its reverse (371333312312), we get a palindrome (584546645485).

The spelling of 213213333173 in words is "two hundred thirteen billion, two hundred thirteen million, three hundred thirty-three thousand, one hundred seventy-three".