11111221202209 has 2 divisors, whose sum is σ = 11111221202210. Its totient is φ = 11111221202208.

The previous prime is 11111221202201. The next prime is 11111221202227. The reversal of 11111221202209 is 90220212211111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8530652049984 + 2580569152225 = 2920728^2 + 1606415^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111221202209 - 2³ = 11111221202201 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111221202201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555610601104 + 5555610601105.

It is an arithmetic number, because the mean of its divisors is an integer number (5555610601105).

Almost surely, 2^{11111221202209} is an apocalyptic number.

It is an amenable number.

11111221202209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111221202209 is an equidigital number, since it uses as much as digits as its factorization.

11111221202209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 11111221202209 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred two thousand, two hundred nine".