221313805 has 16 divisors (see below), whose sum is σ = 288576000. Its totient is φ = 162319680.

The previous prime is 221313793. The next prime is 221313817. The reversal of 221313805 is 508313122.

It is an interprime number because it is at equal distance from previous prime (221313793) and next prime (221313817).

It is not a de Polignac number, because 221313805 - 2²¹ = 219216653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221313805.

It is a congruent 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, 34630 + ... + 40519.

It is an arithmetic number, because the mean of its divisors is an integer number (18036000).

Almost surely, 2^221313805 is an apocalyptic number.

It is an amenable number.

221313805 is a deficient number, since it is larger than the sum of its proper divisors (67262195).

221313805 is a wasteful number, since it uses less digits than its factorization.

221313805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75204.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 221313805 is about 14876.6194076477. The cubic root of 221313805 is about 604.8803852499.

Adding to 221313805 its reverse (508313122), we get a palindrome (729626927).

The spelling of 221313805 in words is "two hundred twenty-one million, three hundred thirteen thousand, eight hundred five".