221118032809 has 2 divisors, whose sum is σ = 221118032810. Its totient is φ = 221118032808.

The previous prime is 221118032803. The next prime is 221118032827. The reversal of 221118032809 is 908230811122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214447717225 + 6670315584 = 463085^2 + 81672^2 .

It is a cyclic number.

It is not a de Polignac number, because 221118032809 - 2¹¹ = 221118030761 is a prime.

It is not a weakly prime, because it can be changed into another prime (221118032803) 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, 110559016404 + 110559016405.

It is an arithmetic number, because the mean of its divisors is an integer number (110559016405).

Almost surely, 2^221118032809 is an apocalyptic number.

It is an amenable number.

221118032809 is a deficient number, since it is larger than the sum of its proper divisors (1).

221118032809 is an equidigital number, since it uses as much as digits as its factorization.

221118032809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 221118032809 in words is "two hundred twenty-one billion, one hundred eighteen million, thirty-two thousand, eight hundred nine".