12120222221 has 4 divisors (see below), whose sum is σ = 12120689244. Its totient is φ = 12119755200.

The previous prime is 12120222203. The next prime is 12120222259. The reversal of 12120222221 is 12222202121.

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: 12222202121 = 5113 ⋅2390417.

It can be written as a sum of positive squares in 2 ways, for example, as 8963355625 + 3156866596 = 94675^2 + 56186^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120222221 - 2²⁶ = 12053113357 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 12120222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120221221) 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, 192140 + ... + 247301.

It is an arithmetic number, because the mean of its divisors is an integer number (3030172311).

Almost surely, 2^12120222221 is an apocalyptic number.

It is an amenable number.

12120222221 is a deficient number, since it is larger than the sum of its proper divisors (467023).

12120222221 is an equidigital number, since it uses as much as digits as its factorization.

12120222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467022.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12120222221 its reverse (12222202121), we get a palindrome (24342424342).

The spelling of 12120222221 in words is "twelve billion, one hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".