30305221 has 4 divisors (see below), whose sum is σ = 30327532. Its totient is φ = 30282912.

The previous prime is 30305201. The next prime is 30305243. The reversal of 30305221 is 12250303.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29582721 + 722500 = 5439^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 30305221 - 2¹⁷ = 30174149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30305195 and 30305204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30305201) 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, 8976 + ... + 11881.

It is an arithmetic number, because the mean of its divisors is an integer number (7581883).

Almost surely, 2^30305221 is an apocalyptic number.

It is an amenable number.

30305221 is a deficient number, since it is larger than the sum of its proper divisors (22311).

30305221 is a wasteful number, since it uses less digits than its factorization.

30305221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22310.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 30305221 is about 5505.0178019694. The cubic root of 30305221 is about 311.7734665329.

Adding to 30305221 its reverse (12250303), we get a palindrome (42555524).

The spelling of 30305221 in words is "thirty million, three hundred five thousand, two hundred twenty-one".