12012220020221 has 4 divisors (see below), whose sum is σ = 12012232376700. Its totient is φ = 12012207663744.

The previous prime is 12012220020211. The next prime is 12012220020247. The reversal of 12012220020221 is 12202002221021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5962533748900 + 6049686271321 = 2441830^2 + 2459611^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012220020221 - 2¹⁰ = 12012220019197 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 12012220020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012220020211) 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, 4582676 + ... + 6710093.

It is an arithmetic number, because the mean of its divisors is an integer number (3003058094175).

Almost surely, 2^{12012220020221} is an apocalyptic number.

It is an amenable number.

12012220020221 is a deficient number, since it is larger than the sum of its proper divisors (12356479).

12012220020221 is a wasteful number, since it uses less digits than its factorization.

12012220020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12356478.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12012220020221 its reverse (12202002221021), we get a palindrome (24214222241242).

The spelling of 12012220020221 in words is "twelve trillion, twelve billion, two hundred twenty million, twenty thousand, two hundred twenty-one".