12011221565617 has 8 divisors (see below), whose sum is σ = 12180482421120. Its totient is φ = 11841963174720.

The previous prime is 12011221565599. The next prime is 12011221565641. The reversal of 12011221565617 is 71656512211021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12011221565617 - 2³¹ = 12009074081969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12011221565617.

It is not an unprimeable number, because it can be changed into a prime (12011221565687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10637484 + ... + 11712322.

It is an arithmetic number, because the mean of its divisors is an integer number (1522560302640).

Almost surely, 2^{12011221565617} is an apocalyptic number.

It is an amenable number.

12011221565617 is a deficient number, since it is larger than the sum of its proper divisors (169260855503).

12011221565617 is a wasteful number, since it uses less digits than its factorization.

12011221565617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232303.

The product of its (nonzero) digits is 50400, while the sum is 40.

Adding to 12011221565617 its reverse (71656512211021), we get a palindrome (83667733776638).

The spelling of 12011221565617 in words is "twelve trillion, eleven billion, two hundred twenty-one million, five hundred sixty-five thousand, six hundred seventeen".