201223220171 has 2 divisors, whose sum is σ = 201223220172. Its totient is φ = 201223220170.

The previous prime is 201223220167. The next prime is 201223220269. The reversal of 201223220171 is 171022322102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201223220171 - 2² = 201223220167 is a prime.

It is not a weakly prime, because it can be changed into another prime (201223220071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100611610085 + 100611610086.

It is an arithmetic number, because the mean of its divisors is an integer number (100611610086).

Almost surely, 2^201223220171 is an apocalyptic number.

201223220171 is a deficient number, since it is larger than the sum of its proper divisors (1).

201223220171 is an equidigital number, since it uses as much as digits as its factorization.

201223220171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 201223220171 its reverse (171022322102), we get a palindrome (372245542273).

The spelling of 201223220171 in words is "two hundred one billion, two hundred twenty-three million, two hundred twenty thousand, one hundred seventy-one".