221604409099 has 2 divisors, whose sum is σ = 221604409100. Its totient is φ = 221604409098.

The previous prime is 221604409043. The next prime is 221604409127. The reversal of 221604409099 is 990904406122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221604409099 - 2²³ = 221596020491 is a prime.

It is not a weakly prime, because it can be changed into another prime (221604709099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110802204549 + 110802204550.

It is an arithmetic number, because the mean of its divisors is an integer number (110802204550).

Almost surely, 2^221604409099 is an apocalyptic number.

221604409099 is a deficient number, since it is larger than the sum of its proper divisors (1).

221604409099 is an equidigital number, since it uses as much as digits as its factorization.

221604409099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 221604409099 in words is "two hundred twenty-one billion, six hundred four million, four hundred nine thousand, ninety-nine".