221330245 has 16 divisors (see below), whose sum is σ = 272365632. Its totient is φ = 172569600.

The previous prime is 221330243. The next prime is 221330251. The reversal of 221330245 is 542033122.

221330245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221330245 - 2¹ = 221330243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221330243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137445 + ... + 139045.

It is an arithmetic number, because the mean of its divisors is an integer number (17022852).

Almost surely, 2^221330245 is an apocalyptic number.

It is an amenable number.

221330245 is a deficient number, since it is larger than the sum of its proper divisors (51035387).

221330245 is a wasteful number, since it uses less digits than its factorization.

221330245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 221330245 is about 14877.1719422745. The cubic root of 221330245 is about 604.8953624558.

Adding to 221330245 its reverse (542033122), we get a palindrome (763363367).

The spelling of 221330245 in words is "two hundred twenty-one million, three hundred thirty thousand, two hundred forty-five".