12001201211221 has 4 divisors (see below), whose sum is σ = 12001208668000. Its totient is φ = 12001193754444.

The previous prime is 12001201211203. The next prime is 12001201211227. The reversal of 12001201211221 is 12211210210021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12001201211221 - 2¹⁷ = 12001201080149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001201211195 and 12001201211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001201211227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203241 + ... + 4903438.

It is an arithmetic number, because the mean of its divisors is an integer number (3000302167000).

Almost surely, 2^{12001201211221} is an apocalyptic number.

It is an amenable number.

12001201211221 is a deficient number, since it is larger than the sum of its proper divisors (7456779).

12001201211221 is an equidigital number, since it uses as much as digits as its factorization.

12001201211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7456778.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12001201211221 its reverse (12211210210021), we get a palindrome (24212411421242).

The spelling of 12001201211221 in words is "twelve trillion, one billion, two hundred one million, two hundred eleven thousand, two hundred twenty-one".