213221203171 has 2 divisors, whose sum is σ = 213221203172. Its totient is φ = 213221203170.

The previous prime is 213221203081. The next prime is 213221203211. The reversal of 213221203171 is 171302122312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213221203171 - 2⁷ = 213221203043 is a prime.

It is not a weakly prime, because it can be changed into another prime (213221203471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106610601585 + 106610601586.

It is an arithmetic number, because the mean of its divisors is an integer number (106610601586).

Almost surely, 2^213221203171 is an apocalyptic number.

213221203171 is a deficient number, since it is larger than the sum of its proper divisors (1).

213221203171 is an equidigital number, since it uses as much as digits as its factorization.

213221203171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 213221203171 its reverse (171302122312), we get a palindrome (384523325483).

The spelling of 213221203171 in words is "two hundred thirteen billion, two hundred twenty-one million, two hundred three thousand, one hundred seventy-one".