171212121220012 has 24 divisors (see below), whose sum is σ = 317259343855440. Its totient is φ = 80567018357760.

The previous prime is 171212121220001. The next prime is 171212121220027. The reversal of 171212121220012 is 210022121212171.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51366562 + ... + 54598057.

It is an arithmetic number, because the mean of its divisors is an integer number (13219139327310).

Almost surely, 2^{171212121220012} is an apocalyptic number.

It is an amenable number.

171212121220012 is a deficient number, since it is larger than the sum of its proper divisors (146047222635428).

171212121220012 is a wasteful number, since it uses less digits than its factorization.

171212121220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105988401 (or 105988399 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 25.

Adding to 171212121220012 its reverse (210022121212171), we get a palindrome (381234242432183).

The spelling of 171212121220012 in words is "one hundred seventy-one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty thousand, twelve".