221342305 has 16 divisors (see below), whose sum is σ = 281033280. Its totient is φ = 166888512.

The previous prime is 221342299. The next prime is 221342321. The reversal of 221342305 is 503243122.

It is a cyclic number.

It is not a de Polignac number, because 221342305 - 2¹⁷ = 221211233 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12802 + ... + 24628.

It is an arithmetic number, because the mean of its divisors is an integer number (17564580).

Almost surely, 2^221342305 is an apocalyptic number.

It is an amenable number.

221342305 is a deficient number, since it is larger than the sum of its proper divisors (59690975).

221342305 is a wasteful number, since it uses less digits than its factorization.

221342305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12048.

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

The square root of 221342305 is about 14877.5772557228. The cubic root of 221342305 is about 604.9063489127.

Adding to 221342305 its reverse (503243122), we get a palindrome (724585427).

The spelling of 221342305 in words is "two hundred twenty-one million, three hundred forty-two thousand, three hundred five".