12226415021 has 2 divisors, whose sum is σ = 12226415022. Its totient is φ = 12226415020.

The previous prime is 12226415009. The next prime is 12226415023. The reversal of 12226415021 is 12051462221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8470441225 + 3755973796 = 92035^2 + 61286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12226415021 is a prime.

It is a Sophie Germain prime.

Together with 12226415023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12226415023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6113207510 + 6113207511.

It is an arithmetic number, because the mean of its divisors is an integer number (6113207511).

Almost surely, 2^12226415021 is an apocalyptic number.

It is an amenable number.

12226415021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12226415021 is an equidigital number, since it uses as much as digits as its factorization.

12226415021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 12226415021 its reverse (12051462221), we get a palindrome (24277877242).

The spelling of 12226415021 in words is "twelve billion, two hundred twenty-six million, four hundred fifteen thousand, twenty-one".