1221222168409 has 2 divisors, whose sum is σ = 1221222168410. Its totient is φ = 1221222168408.

The previous prime is 1221222168403. The next prime is 1221222168443. The reversal of 1221222168409 is 9048612221221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1208741927184 + 12480241225 = 1099428^2 + 111715^2 .

It is an emirp because it is prime and its reverse (9048612221221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221222168409 - 2¹⁹ = 1221221644121 is a prime.

It is a super-2 number, since 2×1221222168409² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221222168403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611084204 + 610611084205.

It is an arithmetic number, because the mean of its divisors is an integer number (610611084205).

Almost surely, 2^{1221222168409} is an apocalyptic number.

It is an amenable number.

1221222168409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222168409 is an equidigital number, since it uses as much as digits as its factorization.

1221222168409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 1221222168409 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred sixty-eight thousand, four hundred nine".