12001000211221 has 32 divisors (see below), whose sum is σ = 13931290419200. Its totient is φ = 10125949268160.

The previous prime is 12001000211149. The next prime is 12001000211231. The reversal of 12001000211221 is 12211200010021.

12001000211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12001000211221 - 2⁷ = 12001000211093 is a prime.

It is a super-2 number, since 2×12001000211221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001000211231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 369484060 + ... + 369516538.

It is an arithmetic number, because the mean of its divisors is an integer number (435352825600).

Almost surely, 2^{12001000211221} is an apocalyptic number.

It is an amenable number.

12001000211221 is a deficient number, since it is larger than the sum of its proper divisors (1930290207979).

12001000211221 is a wasteful number, since it uses less digits than its factorization.

12001000211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35729.

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

Adding to 12001000211221 its reverse (12211200010021), we get a palindrome (24212200221242).

The spelling of 12001000211221 in words is "twelve trillion, one billion, two hundred eleven thousand, two hundred twenty-one".