12122010221 has 4 divisors (see below), whose sum is σ = 12136633500. Its totient is φ = 12107386944.

The previous prime is 12122010161. The next prime is 12122010233. The reversal of 12122010221 is 12201022121.

12122010221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3250254121 + 8871756100 = 57011^2 + 94190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12122010221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12122010196 and 12122010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122010421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7310396 + ... + 7312053.

It is an arithmetic number, because the mean of its divisors is an integer number (3034158375).

Almost surely, 2^12122010221 is an apocalyptic number.

It is an amenable number.

12122010221 is a deficient number, since it is larger than the sum of its proper divisors (14623279).

12122010221 is an equidigital number, since it uses as much as digits as its factorization.

12122010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14623278.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12122010221 its reverse (12201022121), we get a palindrome (24323032342).

The spelling of 12122010221 in words is "twelve billion, one hundred twenty-two million, ten thousand, two hundred twenty-one".