12011221566216 has 64 divisors (see below), whose sum is σ = 33604536840000. Its totient is φ = 3974936623488.

The previous prime is 12011221566131. The next prime is 12011221566269. The reversal of 12011221566216 is 61266512211021.

12011221566216 is a `hidden beast` number, since 1 + 2 + 0 + 1 + 1 + 2 + 21 + 5 + 6 + 621 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 15 ways as a sum of consecutive naturals, for example, 199996981 + ... + 200057028.

It is an arithmetic number, because the mean of its divisors is an integer number (525070888125).

Almost surely, 2^{12011221566216} is an apocalyptic number.

It is an amenable number.

12011221566216 is an abundant number, since it is smaller than the sum of its proper divisors (21593315273784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12011221566216 is a wasteful number, since it uses less digits than its factorization.

12011221566216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400054163 (or 400054153 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

Adding to 12011221566216 its reverse (61266512211021), we get a palindrome (73277733777237).

The spelling of 12011221566216 in words is "twelve trillion, eleven billion, two hundred twenty-one million, five hundred sixty-six thousand, two hundred sixteen".