221306163 has 32 divisors (see below), whose sum is σ = 330220800. Its totient is φ = 130897536.

The previous prime is 221306149. The next prime is 221306171. The reversal of 221306163 is 361603122.

It is a happy number.

It is not a de Polignac number, because 221306163 - 2⁴ = 221306147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221301163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 473656 + ... + 474122.

It is an arithmetic number, because the mean of its divisors is an integer number (10319400).

Almost surely, 2^221306163 is an apocalyptic number.

221306163 is a deficient number, since it is larger than the sum of its proper divisors (108914637).

221306163 is a wasteful number, since it uses less digits than its factorization.

221306163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 221306163 is about 14876.3625594431. The cubic root of 221306163 is about 604.8734229652.

Adding to 221306163 its reverse (361603122), we get a palindrome (582909285).

The spelling of 221306163 in words is "two hundred twenty-one million, three hundred six thousand, one hundred sixty-three".