12011221566105 has 32 divisors (see below), whose sum is σ = 20359797379200. Its totient is φ = 6025791839232.

The previous prime is 12011221566101. The next prime is 12011221566131. The reversal of 12011221566105 is 50166512211021.

It is a happy number.

It is not a de Polignac number, because 12011221566105 - 2² = 12011221566101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12011221566101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12708375 + ... + 13620764.

It is an arithmetic number, because the mean of its divisors is an integer number (636243668100).

Almost surely, 2^{12011221566105} is an apocalyptic number.

12011221566105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12011221566105 is a deficient number, since it is larger than the sum of its proper divisors (8348575813095).

12011221566105 is a wasteful number, since it uses less digits than its factorization.

12011221566105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26330953.

The product of its (nonzero) digits is 7200, while the sum is 33.

Adding to 12011221566105 its reverse (50166512211021), we get a palindrome (62177733777126).

The spelling of 12011221566105 in words is "twelve trillion, eleven billion, two hundred twenty-one million, five hundred sixty-six thousand, one hundred five".