221055415065 has 32 divisors (see below), whose sum is σ = 393091171200. Its totient is φ = 117865091520.

The previous prime is 221055415039. The next prime is 221055415081. The reversal of 221055415065 is 560514550122.

221055415065 is a `hidden beast` number, since 2 + 2 + 1 + 0 + 5 + 541 + 50 + 65 = 666.

It is not a de Polignac number, because 221055415065 - 2⁵ = 221055415033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301566 + ... + 730104.

It is an arithmetic number, because the mean of its divisors is an integer number (12284099100).

Almost surely, 2^221055415065 is an apocalyptic number.

It is an amenable number.

221055415065 is a deficient number, since it is larger than the sum of its proper divisors (172035756135).

221055415065 is a wasteful number, since it uses less digits than its factorization.

221055415065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432374 (or 432368 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

Adding to 221055415065 its reverse (560514550122), we get a palindrome (781569965187).

The spelling of 221055415065 in words is "two hundred twenty-one billion, fifty-five million, four hundred fifteen thousand, sixty-five".