1121221313209 has 2 divisors, whose sum is σ = 1121221313210. Its totient is φ = 1121221313208.

The previous prime is 1121221313207. The next prime is 1121221313263. The reversal of 1121221313209 is 9023131221211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 767249861184 + 353971452025 = 875928^2 + 594955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121221313209 - 2¹ = 1121221313207 is a prime.

It is a super-2 number, since 2×1121221313209² (a number of 25 digits) contains 22 as substring.

Together with 1121221313207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1121221313207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560610656604 + 560610656605.

It is an arithmetic number, because the mean of its divisors is an integer number (560610656605).

Almost surely, 2^{1121221313209} is an apocalyptic number.

It is an amenable number.

1121221313209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121221313209 is an equidigital number, since it uses as much as digits as its factorization.

1121221313209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 1121221313209 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, two hundred nine".