221211102211009 has 2 divisors, whose sum is σ = 221211102211010. Its totient is φ = 221211102211008.

The previous prime is 221211102210941. The next prime is 221211102211027. The reversal of 221211102211009 is 900112201112122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169412090905600 + 51799011305409 = 13015840^2 + 7197153^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211102211009 - 2²³ = 221211093822401 is a prime.

It is not a weakly prime, because it can be changed into another prime (221211102281009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605551105504 + 110605551105505.

It is an arithmetic number, because the mean of its divisors is an integer number (110605551105505).

Almost surely, 2^{221211102211009} is an apocalyptic number.

It is an amenable number.

221211102211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211102211009 is an equidigital number, since it uses as much as digits as its factorization.

221211102211009 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 221211102211009 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred two million, two hundred eleven thousand, nine".