221110001209 has 2 divisors, whose sum is σ = 221110001210. Its totient is φ = 221110001208.

The previous prime is 221110001197. The next prime is 221110001257. The reversal of 221110001209 is 902100011122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215820639225 + 5289361984 = 464565^2 + 72728^2 .

It is a cyclic number.

It is not a de Polignac number, because 221110001209 - 2⁷ = 221110001081 is a prime.

It is not a weakly prime, because it can be changed into another prime (221110001009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555000604 + 110555000605.

It is an arithmetic number, because the mean of its divisors is an integer number (110555000605).

Almost surely, 2^221110001209 is an apocalyptic number.

It is an amenable number.

221110001209 is a deficient number, since it is larger than the sum of its proper divisors (1).

221110001209 is an equidigital number, since it uses as much as digits as its factorization.

221110001209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 221110001209 in words is "two hundred twenty-one billion, one hundred ten million, one thousand, two hundred nine".