12011212220221 has 4 divisors (see below), whose sum is σ = 12011222272252. Its totient is φ = 12011202168192.

The previous prime is 12011212220209. The next prime is 12011212220239. The reversal of 12011212220221 is 12202221211021.

12011212220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1214434856196 + 10796777364025 = 1102014^2 + 3285845^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011212220221 - 2¹⁹ = 12011211695933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011212220251) 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, 2946996 + ... + 5719021.

It is an arithmetic number, because the mean of its divisors is an integer number (3002805568063).

Almost surely, 2^{12011212220221} is an apocalyptic number.

It is an amenable number.

12011212220221 is a deficient number, since it is larger than the sum of its proper divisors (10052031).

12011212220221 is an equidigital number, since it uses as much as digits as its factorization.

12011212220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10052030.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12011212220221 its reverse (12202221211021), we get a palindrome (24213433431242).

The spelling of 12011212220221 in words is "twelve trillion, eleven billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty-one".