221211210220009 has 2 divisors, whose sum is σ = 221211210220010. Its totient is φ = 221211210220008.

The previous prime is 221211210219971. The next prime is 221211210220051. The reversal of 221211210220009 is 900022012112122.

It is a happy number.

221211210220009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145662571355625 + 75548638864384 = 12069075^2 + 8691872^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211210220009 - 2⁴¹ = 219012186964457 is a prime.

It is not a weakly prime, because it can be changed into another prime (221211210224009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605605110004 + 110605605110005.

It is an arithmetic number, because the mean of its divisors is an integer number (110605605110005).

Almost surely, 2^{221211210220009} is an apocalyptic number.

It is an amenable number.

221211210220009 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211210220009 is an equidigital number, since it uses as much as digits as its factorization.

221211210220009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 221211210220009 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred ten million, two hundred twenty thousand, nine".