221605563 has 8 divisors (see below), whose sum is σ = 296016448. Its totient is φ = 147465864.

The previous prime is 221605537. The next prime is 221605567. The reversal of 221605563 is 365506122.

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

It is not a de Polignac number, because 221605563 - 2⁶ = 221605499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221605563.

It is not an unprimeable number, because it can be changed into a prime (221605567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65881 + ... + 69162.

It is an arithmetic number, because the mean of its divisors is an integer number (37002056).

Almost surely, 2^221605563 is an apocalyptic number.

221605563 is a deficient number, since it is larger than the sum of its proper divisors (74410885).

221605563 is a wasteful number, since it uses less digits than its factorization.

221605563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135593.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 221605563 is about 14886.4221020365. The cubic root of 221605563 is about 605.1460731458.

The spelling of 221605563 in words is "two hundred twenty-one million, six hundred five thousand, five hundred sixty-three".