12201020243171 has 4 divisors (see below), whose sum is σ = 12211827171000. Its totient is φ = 12190213315344.

The previous prime is 12201020243147. The next prime is 12201020243233. The reversal of 12201020243171 is 17134202010221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12201020243171 - 2¹⁸ = 12201019981027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12201020243171.

It is not an unprimeable number, because it can be changed into a prime (12201020245171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5403462221 + ... + 5403464478.

It is an arithmetic number, because the mean of its divisors is an integer number (3052956792750).

Almost surely, 2^{12201020243171} is an apocalyptic number.

12201020243171 is a deficient number, since it is larger than the sum of its proper divisors (10806927829).

12201020243171 is a wasteful number, since it uses less digits than its factorization.

12201020243171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10806927828.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 12201020243171 its reverse (17134202010221), we get a palindrome (29335222253392).

The spelling of 12201020243171 in words is "twelve trillion, two hundred one billion, twenty million, two hundred forty-three thousand, one hundred seventy-one".