221675865 has 16 divisors (see below), whose sum is σ = 359976768. Its totient is φ = 116462016.

The previous prime is 221675849. The next prime is 221675887. The reversal of 221675865 is 568576122.

It is not a de Polignac number, because 221675865 - 2⁴ = 221675849 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109282 + ... + 111291.

It is an arithmetic number, because the mean of its divisors is an integer number (22498548).

Almost surely, 2^221675865 is an apocalyptic number.

It is an amenable number.

221675865 is a deficient number, since it is larger than the sum of its proper divisors (138300903).

221675865 is a wasteful number, since it uses less digits than its factorization.

221675865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220648.

The product of its digits is 201600, while the sum is 42.

The square root of 221675865 is about 14888.7831940693. The cubic root of 221675865 is about 605.2100584247.

The spelling of 221675865 in words is "two hundred twenty-one million, six hundred seventy-five thousand, eight hundred sixty-five".