12012011220221 has 4 divisors (see below), whose sum is σ = 12012018152700. Its totient is φ = 12012004287744.

The previous prime is 12012011220217. The next prime is 12012011220247. The reversal of 12012011220221 is 12202211021021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7074860539321 + 4937150680900 = 2659861^2 + 2221970^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012011220221 - 2² = 12012011220217 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 12012011220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012011226221) 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, 1653725 + ... + 5172893.

It is an arithmetic number, because the mean of its divisors is an integer number (3003004538175).

Almost surely, 2^{12012011220221} is an apocalyptic number.

It is an amenable number.

12012011220221 is a deficient number, since it is larger than the sum of its proper divisors (6932479).

12012011220221 is an equidigital number, since it uses as much as digits as its factorization.

12012011220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6932478.

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

Adding to 12012011220221 its reverse (12202211021021), we get a palindrome (24214222241242).

The spelling of 12012011220221 in words is "twelve trillion, twelve billion, eleven million, two hundred twenty thousand, two hundred twenty-one".