12663121604521 has 8 divisors (see below), whose sum is σ = 12694616770304. Its totient is φ = 12631636808640.

The previous prime is 12663121604519. The next prime is 12663121604557. The reversal of 12663121604521 is 12540612136621.

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 12663121604521 - 2¹ = 12663121604519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12663121604621) 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, 144285 + ... + 5034586.

It is an arithmetic number, because the mean of its divisors is an integer number (1586827096288).

Almost surely, 2^{12663121604521} is an apocalyptic number.

It is an amenable number.

12663121604521 is a deficient number, since it is larger than the sum of its proper divisors (31495165783).

12663121604521 is an equidigital number, since it uses as much as digits as its factorization.

12663121604521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5184951.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 12663121604521 in words is "twelve trillion, six hundred sixty-three billion, one hundred twenty-one million, six hundred four thousand, five hundred twenty-one".