303222221 has 4 divisors (see below), whose sum is σ = 304402332. Its totient is φ = 302042112.

The previous prime is 303222209. The next prime is 303222223. The reversal of 303222221 is 122222303.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122222303 = 7 ⋅17460329.

It can be written as a sum of positive squares in 2 ways, for example, as 144336196 + 158886025 = 12014^2 + 12605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-303222221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 303222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (303222223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589670 + ... + 590183.

It is an arithmetic number, because the mean of its divisors is an integer number (76100583).

Almost surely, 2^303222221 is an apocalyptic number.

It is an amenable number.

303222221 is a deficient number, since it is larger than the sum of its proper divisors (1180111).

303222221 is a wasteful number, since it uses less digits than its factorization.

303222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180110.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 303222221 is about 17413.2771470508. The cubic root of 303222221 is about 671.8211543681.

Adding to 303222221 its reverse (122222303), we get a palindrome (425444524).

The spelling of 303222221 in words is "three hundred three million, two hundred twenty-two thousand, two hundred twenty-one".