12226011781 has 2 divisors, whose sum is σ = 12226011782. Its totient is φ = 12226011780.

The previous prime is 12226011731. The next prime is 12226011793. The reversal of 12226011781 is 18711062221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7576135681 + 4649876100 = 87041^2 + 68190^2 .

It is an emirp because it is prime and its reverse (18711062221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12226011781 - 2⁷ = 12226011653 is a prime.

It is a super-2 number, since 2×12226011781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12226011731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6113005890 + 6113005891.

It is an arithmetic number, because the mean of its divisors is an integer number (6113005891).

Almost surely, 2^12226011781 is an apocalyptic number.

It is an amenable number.

12226011781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12226011781 is an equidigital number, since it uses as much as digits as its factorization.

12226011781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 31.

The spelling of 12226011781 in words is "twelve billion, two hundred twenty-six million, eleven thousand, seven hundred eighty-one".