12221220211 has 4 divisors (see below), whose sum is σ = 12368463912. Its totient is φ = 12073976512.

The previous prime is 12221220173. The next prime is 12221220229. The reversal of 12221220211 is 11202212221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11202212221 = 5449 ⋅2055829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221220211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221220251) 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, 73621726 + ... + 73621891.

It is an arithmetic number, because the mean of its divisors is an integer number (3092115978).

Almost surely, 2^12221220211 is an apocalyptic number.

12221220211 is a deficient number, since it is larger than the sum of its proper divisors (147243701).

12221220211 is an equidigital number, since it uses as much as digits as its factorization.

12221220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147243700.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12221220211 its reverse (11202212221), we get a palindrome (23423432432).

The spelling of 12221220211 in words is "twelve billion, two hundred twenty-one million, two hundred twenty thousand, two hundred eleven".