221550946 has 16 divisors (see below), whose sum is σ = 334946304. Its totient is φ = 109905984.

The previous prime is 221550941. The next prime is 221550947. The reversal of 221550946 is 649055122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221550941) 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 7 ways as a sum of consecutive naturals, for example, 170170 + ... + 171466.

It is an arithmetic number, because the mean of its divisors is an integer number (20934144).

Almost surely, 2^221550946 is an apocalyptic number.

221550946 is a deficient number, since it is larger than the sum of its proper divisors (113395358).

221550946 is a wasteful number, since it uses less digits than its factorization.

221550946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 221550946 is about 14884.5875320749. The cubic root of 221550946 is about 605.0963542093.

The spelling of 221550946 in words is "two hundred twenty-one million, five hundred fifty thousand, nine hundred forty-six".