12011221566101 has 2 divisors, whose sum is σ = 12011221566102. Its totient is φ = 12011221566100.

The previous prime is 12011221566073. The next prime is 12011221566131. The reversal of 12011221566101 is 10166512211021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11957037831025 + 54183735076 = 3457895^2 + 232774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011221566101 is a prime.

It is a super-2 number, since 2×12011221566101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12011221566131) 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 as a sum of consecutive naturals, namely, 6005610783050 + 6005610783051.

It is an arithmetic number, because the mean of its divisors is an integer number (6005610783051).

Almost surely, 2^{12011221566101} is an apocalyptic number.

It is an amenable number.

12011221566101 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011221566101 is an equidigital number, since it uses as much as digits as its factorization.

12011221566101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 29.

Adding to 12011221566101 its reverse (10166512211021), we get a palindrome (22177733777122).

The spelling of 12011221566101 in words is "twelve trillion, eleven billion, two hundred twenty-one million, five hundred sixty-six thousand, one hundred one".