12171220245 has 32 divisors (see below), whose sum is σ = 22045996800. Its totient is φ = 6368836032.

The previous prime is 12171220213. The next prime is 12171220253. The reversal of 12171220245 is 54202217121.

It is a happy number.

12171220245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12171220245 - 2⁵ = 12171220213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 843385 + ... + 857694.

It is an arithmetic number, because the mean of its divisors is an integer number (688937400).

Almost surely, 2^12171220245 is an apocalyptic number.

12171220245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12171220245 is a deficient number, since it is larger than the sum of its proper divisors (9874776555).

12171220245 is a wasteful number, since it uses less digits than its factorization.

12171220245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701146 (or 1701140 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

Adding to 12171220245 its reverse (54202217121), we get a palindrome (66373437366).

The spelling of 12171220245 in words is "twelve billion, one hundred seventy-one million, two hundred twenty thousand, two hundred forty-five".