12221212111121 has 48 divisors (see below), whose sum is σ = 14264022011904. Its totient is φ = 10403135503488.

The previous prime is 12221212111111. The next prime is 12221212111123. The reversal of 12221212111121 is 12111121212221.

It is a happy number.

It is not a de Polignac number, because 12221212111121 - 2⁴² = 7823165600017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12221212111093 and 12221212111102.

It is not an unprimeable number, because it can be changed into a prime (12221212111123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31395140 + ... + 31782026.

It is an arithmetic number, because the mean of its divisors is an integer number (297167125248).

Almost surely, 2^{12221212111121} is an apocalyptic number.

It is an amenable number.

12221212111121 is a deficient number, since it is larger than the sum of its proper divisors (2042809900783).

12221212111121 is a wasteful number, since it uses less digits than its factorization.

12221212111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387118 (or 387099 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

Adding to 12221212111121 its reverse (12111121212221), we get a palindrome (24332333323342).

The spelling of 12221212111121 in words is "twelve trillion, two hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred twenty-one".