1222111221509 has 2 divisors, whose sum is σ = 1222111221510. Its totient is φ = 1222111221508.

The previous prime is 1222111221493. The next prime is 1222111221521. The reversal of 1222111221509 is 9051221112221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 716443744900 + 505667476609 = 846430^2 + 711103^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222111221509 - 2⁴ = 1222111221493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222111221209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611055610754 + 611055610755.

It is an arithmetic number, because the mean of its divisors is an integer number (611055610755).

Almost surely, 2^{1222111221509} is an apocalyptic number.

It is an amenable number.

1222111221509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222111221509 is an equidigital number, since it uses as much as digits as its factorization.

1222111221509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 29.

The spelling of 1222111221509 in words is "one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, five hundred nine".