12011220211 has 4 divisors (see below), whose sum is σ = 12046862152. Its totient is φ = 11975578272.

The previous prime is 12011220197. The next prime is 12011220223. The reversal of 12011220211 is 11202211021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11202211021 = 409 ⋅27389269.

It is a cyclic number.

It is not a de Polignac number, because 12011220211 - 2⁷ = 12011220083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011220191 and 12011220200.

It is not an unprimeable number, because it can be changed into a prime (12011220271) 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, 17820465 + ... + 17821138.

It is an arithmetic number, because the mean of its divisors is an integer number (3011715538).

Almost surely, 2^12011220211 is an apocalyptic number.

12011220211 is a deficient number, since it is larger than the sum of its proper divisors (35641941).

12011220211 is an equidigital number, since it uses as much as digits as its factorization.

12011220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35641940.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12011220211 its reverse (11202211021), we get a palindrome (23213431232).

The spelling of 12011220211 in words is "twelve billion, eleven million, two hundred twenty thousand, two hundred eleven".