221312303171 has 2 divisors, whose sum is σ = 221312303172. Its totient is φ = 221312303170.

The previous prime is 221312303159. The next prime is 221312303213. The reversal of 221312303171 is 171303213122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221312303171 - 2³⁴ = 204132433987 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221312303171.

It is not a weakly prime, because it can be changed into another prime (221312303071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110656151585 + 110656151586.

It is an arithmetic number, because the mean of its divisors is an integer number (110656151586).

Almost surely, 2^221312303171 is an apocalyptic number.

221312303171 is a deficient number, since it is larger than the sum of its proper divisors (1).

221312303171 is an equidigital number, since it uses as much as digits as its factorization.

221312303171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 221312303171 its reverse (171303213122), we get a palindrome (392615516293).

The spelling of 221312303171 in words is "two hundred twenty-one billion, three hundred twelve million, three hundred three thousand, one hundred seventy-one".