12001221120001 has 2 divisors, whose sum is σ = 12001221120002. Its totient is φ = 12001221120000.

The previous prime is 12001221119999. The next prime is 12001221120019. The reversal of 12001221120001 is 10002112210021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11491767782401 + 509453337600 = 3389951^2 + 713760^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001221120001 - 2¹ = 12001221119999 is a prime.

Together with 12001221119999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12001221127001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000610560000 + 6000610560001.

It is an arithmetic number, because the mean of its divisors is an integer number (6000610560001).

Almost surely, 2^{12001221120001} is an apocalyptic number.

It is an amenable number.

12001221120001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001221120001 is an equidigital number, since it uses as much as digits as its factorization.

12001221120001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12001221120001 its reverse (10002112210021), we get a palindrome (22003333330022).

The spelling of 12001221120001 in words is "twelve trillion, one billion, two hundred twenty-one million, one hundred twenty thousand, one".