1221222168497 has 2 divisors, whose sum is σ = 1221222168498. Its totient is φ = 1221222168496.

The previous prime is 1221222168443. The next prime is 1221222168527. The reversal of 1221222168497 is 7948612221221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1116908671921 + 104313496576 = 1056839^2 + 322976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221222168497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221225168497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611084248 + 610611084249.

It is an arithmetic number, because the mean of its divisors is an integer number (610611084249).

Almost surely, 2^{1221222168497} is an apocalyptic number.

It is an amenable number.

1221222168497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222168497 is an equidigital number, since it uses as much as digits as its factorization.

1221222168497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The spelling of 1221222168497 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred sixty-eight thousand, four hundred ninety-seven".