221605161105 has 8 divisors (see below), whose sum is σ = 354568257792. Its totient is φ = 118189419248.

The previous prime is 221605161103. The next prime is 221605161109. The reversal of 221605161105 is 501161506122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221605161105 - 2¹ = 221605161103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221605161103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7386838689 + ... + 7386838718.

It is an arithmetic number, because the mean of its divisors is an integer number (44321032224).

Almost surely, 2^221605161105 is an apocalyptic number.

It is an amenable number.

221605161105 is a deficient number, since it is larger than the sum of its proper divisors (132963096687).

221605161105 is a wasteful number, since it uses less digits than its factorization.

221605161105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14773677415.

The product of its (nonzero) digits is 3600, while the sum is 30.

Adding to 221605161105 its reverse (501161506122), we get a palindrome (722766667227).

The spelling of 221605161105 in words is "two hundred twenty-one billion, six hundred five million, one hundred sixty-one thousand, one hundred five".