12122332221 has 4 divisors (see below), whose sum is σ = 16163109632. Its totient is φ = 8081554812.

The previous prime is 12122332219. The next prime is 12122332223. The reversal of 12122332221 is 12223322121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12223322121 = 3 ⋅4074440707.

It is an interprime number because it is at equal distance from previous prime (12122332219) and next prime (12122332223).

It is not a de Polignac number, because 12122332221 - 2¹ = 12122332219 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 (12122332223) 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, 2020388701 + ... + 2020388706.

It is an arithmetic number, because the mean of its divisors is an integer number (4040777408).

Almost surely, 2^12122332221 is an apocalyptic number.

It is an amenable number.

12122332221 is a deficient number, since it is larger than the sum of its proper divisors (4040777411).

12122332221 is an equidigital number, since it uses as much as digits as its factorization.

12122332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040777410.

The product of its digits is 576, while the sum is 21.

Adding to 12122332221 its reverse (12223322121), we get a palindrome (24345654342).

The spelling of 12122332221 in words is "twelve billion, one hundred twenty-two million, three hundred thirty-two thousand, two hundred twenty-one".