12021002211221 has 4 divisors (see below), whose sum is σ = 12082022527212. Its totient is φ = 11959981895232.

The previous prime is 12021002211209. The next prime is 12021002211289. The reversal of 12021002211221 is 12211220012021.

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 11163878055121 + 857124156100 = 3341239^2 + 925810^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021002211221 - 2²² = 12020998016917 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 12021002211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021002211521) 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, 30510157700 + ... + 30510158093.

It is an arithmetic number, because the mean of its divisors is an integer number (3020505631803).

Almost surely, 2^{12021002211221} is an apocalyptic number.

It is an amenable number.

12021002211221 is a deficient number, since it is larger than the sum of its proper divisors (61020315991).

12021002211221 is an equidigital number, since it uses as much as digits as its factorization.

12021002211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61020315990.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12021002211221 its reverse (12211220012021), we get a palindrome (24232222223242).

The spelling of 12021002211221 in words is "twelve trillion, twenty-one billion, two million, two hundred eleven thousand, two hundred twenty-one".