213171311 has 2 divisors, whose sum is σ = 213171312. Its totient is φ = 213171310.

The previous prime is 213171293. The next prime is 213171349. The reversal of 213171311 is 113171312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213171311 - 2¹⁴ = 213154927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213171391) 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, 106585655 + 106585656.

It is an arithmetic number, because the mean of its divisors is an integer number (106585656).

Almost surely, 2^213171311 is an apocalyptic number.

213171311 is a deficient number, since it is larger than the sum of its proper divisors (1).

213171311 is an equidigital number, since it uses as much as digits as its factorization.

213171311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126, while the sum is 20.

The square root of 213171311 is about 14600.3873578751. The cubic root of 213171311 is about 597.3693263019.

Subtracting from 213171311 its reverse (113171312), we obtain a palindrome (99999999).

The spelling of 213171311 in words is "two hundred thirteen million, one hundred seventy-one thousand, three hundred eleven".