12122011205 has 4 divisors (see below), whose sum is σ = 14546413452. Its totient is φ = 9697608960.

The previous prime is 12122011199. The next prime is 12122011219. The reversal of 12122011205 is 50211022121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1294776289 + 10827234916 = 35983^2 + 104054^2 .

It is not a de Polignac number, because 12122011205 - 2¹² = 12122007109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212201116 + ... + 1212201125.

It is an arithmetic number, because the mean of its divisors is an integer number (3636603363).

Almost surely, 2^12122011205 is an apocalyptic number.

It is an amenable number.

12122011205 is a deficient number, since it is larger than the sum of its proper divisors (2424402247).

12122011205 is an equidigital number, since it uses as much as digits as its factorization.

12122011205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424402246.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 12122011205 its reverse (50211022121), we get a palindrome (62333033326).

The spelling of 12122011205 in words is "twelve billion, one hundred twenty-two million, eleven thousand, two hundred five".