122221221211 has 4 divisors (see below), whose sum is σ = 123030633424. Its totient is φ = 121411809000.

The previous prime is 122221221137. The next prime is 122221221229. The reversal of 122221221211 is 112122122221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112122122221 = 1063 ⋅105477067.

It is a cyclic number.

It is not a de Polignac number, because 122221221211 - 2¹⁵ = 122221188443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122221228211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404705880 + ... + 404706181.

It is an arithmetic number, because the mean of its divisors is an integer number (30757658356).

Almost surely, 2^122221221211 is an apocalyptic number.

122221221211 is a deficient number, since it is larger than the sum of its proper divisors (809412213).

122221221211 is an equidigital number, since it uses as much as digits as its factorization.

122221221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809412212.

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

Adding to 122221221211 its reverse (112122122221), we get a palindrome (234343343432).

The spelling of 122221221211 in words is "one hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred eleven".