12021221211 has 8 divisors (see below), whose sum is σ = 16031755344. Its totient is φ = 8012417280.

The previous prime is 12021221209. The next prime is 12021221231. The reversal of 12021221211 is 11212212021.

12021221211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12021221211 - 2¹ = 12021221209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12021221231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416250 + ... + 444191.

It is an arithmetic number, because the mean of its divisors is an integer number (2003969418).

Almost surely, 2^12021221211 is an apocalyptic number.

12021221211 is a deficient number, since it is larger than the sum of its proper divisors (4010534133).

12021221211 is an equidigital number, since it uses as much as digits as its factorization.

12021221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865101.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12021221211 its reverse (11212212021), we get a palindrome (23233433232).

The spelling of 12021221211 in words is "twelve billion, twenty-one million, two hundred twenty-one thousand, two hundred eleven".