12221122211 has 4 divisors (see below), whose sum is σ = 12223738800. Its totient is φ = 12218505624.

The previous prime is 12221122187. The next prime is 12221122217. The reversal of 12221122211 is 11222112221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11222112221 = 241 ⋅46564781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221122211 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 12221122211.

It is not an unprimeable number, because it can be changed into a prime (12221122217) 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, 1301276 + ... + 1310633.

It is an arithmetic number, because the mean of its divisors is an integer number (3055934700).

Almost surely, 2^12221122211 is an apocalyptic number.

12221122211 is a deficient number, since it is larger than the sum of its proper divisors (2616589).

12221122211 is an equidigital number, since it uses as much as digits as its factorization.

12221122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616588.

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

Adding to 12221122211 its reverse (11222112221), we get a palindrome (23443234432).

The spelling of 12221122211 in words is "twelve billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred eleven".