12001312321221 has 16 divisors (see below), whose sum is σ = 16106667827328. Its totient is φ = 7948434811200.

The previous prime is 12001312321181. The next prime is 12001312321289. The reversal of 12001312321221 is 12212321310021.

It is not a de Polignac number, because 12001312321221 - 2¹¹ = 12001312319173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001312321291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166816 + ... + 4902086.

It is an arithmetic number, because the mean of its divisors is an integer number (1006666739208).

Almost surely, 2^{12001312321221} is an apocalyptic number.

It is an amenable number.

12001312321221 is a deficient number, since it is larger than the sum of its proper divisors (4105355506107).

12001312321221 is a wasteful number, since it uses less digits than its factorization.

12001312321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4740812.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 12001312321221 its reverse (12212321310021), we get a palindrome (24213633631242).

The spelling of 12001312321221 in words is "twelve trillion, one billion, three hundred twelve million, three hundred twenty-one thousand, two hundred twenty-one".