303223221 has 18 divisors (see below), whose sum is σ = 509498262. Its totient is φ = 173270160.

The previous prime is 303223201. The next prime is 303223259. The reversal of 303223221 is 122322303.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 221682321 + 81540900 = 14889^2 + 9030^2 .

It is not a de Polignac number, because 303223221 - 2⁵ = 303223189 is a prime.

It is a super-2 number, since 2×303223221² = 183888643507229682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 303223194 and 303223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (303223201) 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 17 ways as a sum of consecutive naturals, for example, 343350 + ... + 344231.

It is an arithmetic number, because the mean of its divisors is an integer number (28305459).

Almost surely, 2^303223221 is an apocalyptic number.

It is an amenable number.

303223221 is a deficient number, since it is larger than the sum of its proper divisors (206275041).

303223221 is a wasteful number, since it uses less digits than its factorization.

303223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687601 (or 687591 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 303223221 is about 17413.3058607491. The cubic root of 303223221 is about 671.8218929028.

Adding to 303223221 its reverse (122322303), we get a palindrome (425545524).

The spelling of 303223221 in words is "three hundred three million, two hundred twenty-three thousand, two hundred twenty-one".