12221120012261 has 2 divisors, whose sum is σ = 12221120012262. Its totient is φ = 12221120012260.

The previous prime is 12221120012251. The next prime is 12221120012281. The reversal of 12221120012261 is 16221002112221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8322446068225 + 3898673944036 = 2884865^2 + 1974506^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221120012261 - 2²² = 12221115817957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221120012251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110560006130 + 6110560006131.

It is an arithmetic number, because the mean of its divisors is an integer number (6110560006131).

Almost surely, 2^{12221120012261} is an apocalyptic number.

It is an amenable number.

12221120012261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221120012261 is an equidigital number, since it uses as much as digits as its factorization.

12221120012261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 12221120012261 its reverse (16221002112221), we get a palindrome (28442122124482).

The spelling of 12221120012261 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty million, twelve thousand, two hundred sixty-one".