1201221212171 has 2 divisors, whose sum is σ = 1201221212172. Its totient is φ = 1201221212170.

The previous prime is 1201221212143. The next prime is 1201221212239. The reversal of 1201221212171 is 1712121221021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1201221212171 - 2¹⁰ = 1201221211147 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201221212141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600610606085 + 600610606086.

It is an arithmetic number, because the mean of its divisors is an integer number (600610606086).

Almost surely, 2^{1201221212171} is an apocalyptic number.

1201221212171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201221212171 is an equidigital number, since it uses as much as digits as its factorization.

1201221212171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 1201221212171 its reverse (1712121221021), we get a palindrome (2913342433192).

The spelling of 1201221212171 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred seventy-one".