221345305 has 8 divisors (see below), whose sum is σ = 266603400. Its totient is φ = 176416896.

The previous prime is 221345297. The next prime is 221345317. The reversal of 221345305 is 503543122.

221345305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 168921 + 221176384 = 411^2 + 14872^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 221345305 - 2³ = 221345297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221345305.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80940 + ... + 83629.

It is an arithmetic number, because the mean of its divisors is an integer number (33325425).

Almost surely, 2^221345305 is an apocalyptic number.

It is an amenable number.

221345305 is a deficient number, since it is larger than the sum of its proper divisors (45258095).

221345305 is a wasteful number, since it uses less digits than its factorization.

221345305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164843.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 221345305 is about 14877.6780782486. The cubic root of 221345305 is about 604.9090818002.

Adding to 221345305 its reverse (503543122), we get a palindrome (724888427).

The spelling of 221345305 in words is "two hundred twenty-one million, three hundred forty-five thousand, three hundred five".