221505065 has 16 divisors (see below), whose sum is σ = 278208000. Its totient is φ = 168983232.

The previous prime is 221505049. The next prime is 221505077. The reversal of 221505065 is 560505122.

It is a cyclic number.

It is not a de Polignac number, because 221505065 - 2⁴ = 221505049 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37376 + ... + 42894.

It is an arithmetic number, because the mean of its divisors is an integer number (17388000).

Almost surely, 2^221505065 is an apocalyptic number.

It is an amenable number.

221505065 is a deficient number, since it is larger than the sum of its proper divisors (56702935).

221505065 is a wasteful number, since it uses less digits than its factorization.

221505065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5896.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 221505065 is about 14883.0462271673. The cubic root of 221505065 is about 605.0545815110.

The spelling of 221505065 in words is "two hundred twenty-one million, five hundred five thousand, sixty-five".