12122312221 has 4 divisors (see below), whose sum is σ = 12327775200. Its totient is φ = 11916849244.

The previous prime is 12122312207. The next prime is 12122312233. The reversal of 12122312221 is 12221322121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12122312221 - 2¹⁵ = 12122279453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122313221) 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, 102731401 + ... + 102731518.

It is an arithmetic number, because the mean of its divisors is an integer number (3081943800).

Almost surely, 2^12122312221 is an apocalyptic number.

It is an amenable number.

12122312221 is a deficient number, since it is larger than the sum of its proper divisors (205462979).

12122312221 is an equidigital number, since it uses as much as digits as its factorization.

12122312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205462978.

The product of its digits is 192, while the sum is 19.

Adding to 12122312221 its reverse (12221322121), we get a palindrome (24343634342).

The spelling of 12122312221 in words is "twelve billion, one hundred twenty-two million, three hundred twelve thousand, two hundred twenty-one".