1221330411397 has 2 divisors, whose sum is σ = 1221330411398. Its totient is φ = 1221330411396.

The previous prime is 1221330411383. The next prime is 1221330411401. The reversal of 1221330411397 is 7931140331221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034195438116 + 187134973281 = 1016954^2 + 432591^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221330411397 - 2²⁷ = 1221196193669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221330417397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610665205698 + 610665205699.

It is an arithmetic number, because the mean of its divisors is an integer number (610665205699).

Almost surely, 2^{1221330411397} is an apocalyptic number.

It is an amenable number.

1221330411397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221330411397 is an equidigital number, since it uses as much as digits as its factorization.

1221330411397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The spelling of 1221330411397 in words is "one trillion, two hundred twenty-one billion, three hundred thirty million, four hundred eleven thousand, three hundred ninety-seven".