221422305 has 32 divisors (see below), whose sum is σ = 393845760. Its totient is φ = 105488640.

The previous prime is 221422291. The next prime is 221422307. The reversal of 221422305 is 503224122.

It is not a de Polignac number, because 221422305 - 2⁶ = 221422241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221422307) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 12270 + ... + 24359.

It is an arithmetic number, because the mean of its divisors is an integer number (12307680).

Almost surely, 2^221422305 is an apocalyptic number.

It is an amenable number.

221422305 is a deficient number, since it is larger than the sum of its proper divisors (172423455).

221422305 is a wasteful number, since it uses less digits than its factorization.

221422305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36681.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221422305 is about 14880.2656226292. The cubic root of 221422305 is about 604.9792174634.

Adding to 221422305 its reverse (503224122), we get a palindrome (724646427).

The spelling of 221422305 in words is "two hundred twenty-one million, four hundred twenty-two thousand, three hundred five".