12012111210221 has 8 divisors (see below), whose sum is σ = 12118531839864. Its totient is φ = 11905692664320.

The previous prime is 12012111210179. The next prime is 12012111210227. The reversal of 12012111210221 is 12201211121021.

It can be written as a sum of positive squares in 4 ways, for example, as 455415774025 + 11556695436196 = 674845^2 + 3399514^2 .

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 12012111210221 - 2⁶ = 12012111210157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12012111210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012111210227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12493145 + ... + 13420241.

It is an arithmetic number, because the mean of its divisors is an integer number (1514816479983).

Almost surely, 2^{12012111210221} is an apocalyptic number.

It is an amenable number.

12012111210221 is a deficient number, since it is larger than the sum of its proper divisors (106420629643).

12012111210221 is a wasteful number, since it uses less digits than its factorization.

12012111210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041871.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12012111210221 its reverse (12201211121021), we get a palindrome (24213322331242).

The spelling of 12012111210221 in words is "twelve trillion, twelve billion, one hundred eleven million, two hundred ten thousand, two hundred twenty-one".