12321221406665 has 8 divisors (see below), whose sum is σ = 14815825990080. Its totient is φ = 9836736923952.

The previous prime is 12321221406647. The next prime is 12321221406679. The reversal of 12321221406665 is 56660412212321.

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 12321221406665 - 2¹² = 12321221402569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2530022495 + ... + 2530027364.

It is an arithmetic number, because the mean of its divisors is an integer number (1851978248760).

Almost surely, 2^{12321221406665} is an apocalyptic number.

It is an amenable number.

12321221406665 is a deficient number, since it is larger than the sum of its proper divisors (2494604583415).

12321221406665 is an equidigital number, since it uses as much as digits as its factorization.

12321221406665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5060050351.

The product of its (nonzero) digits is 207360, while the sum is 41.

Adding to 12321221406665 its reverse (56660412212321), we get a palindrome (68981633618986).

The spelling of 12321221406665 in words is "twelve trillion, three hundred twenty-one billion, two hundred twenty-one million, four hundred six thousand, six hundred sixty-five".