12228170516221 has 32 divisors (see below), whose sum is σ = 14524700360832. Its totient is φ = 10166893148160.

The previous prime is 12228170516173. The next prime is 12228170516227. The reversal of 12228170516221 is 12261507182221.

It is a cyclic number.

It is not a de Polignac number, because 12228170516221 - 2¹¹ = 12228170514173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12228170516227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4322425 + ... + 6568081.

It is an arithmetic number, because the mean of its divisors is an integer number (453896886276).

Almost surely, 2^{12228170516221} is an apocalyptic number.

12228170516221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12228170516221 is a deficient number, since it is larger than the sum of its proper divisors (2296529844611).

12228170516221 is a wasteful number, since it uses less digits than its factorization.

12228170516221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246509.

The product of its (nonzero) digits is 53760, while the sum is 40.

Adding to 12228170516221 its reverse (12261507182221), we get a palindrome (24489677698442).

The spelling of 12228170516221 in words is "twelve trillion, two hundred twenty-eight billion, one hundred seventy million, five hundred sixteen thousand, two hundred twenty-one".