30303221 has 10 divisors (see below), whose sum is σ = 32859342. Its totient is φ = 27945840.

The previous prime is 30303211. The next prime is 30303239. The reversal of 30303221 is 12230303.

It can be written as a sum of positive squares in 5 ways, for example, as 23902321 + 6400900 = 4889^2 + 2530^2 .

It is a de Polignac number, because none of the positive numbers 2^k-30303221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30303196 and 30303205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30303211) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 28031 + ... + 29091.

Almost surely, 2^30303221 is an apocalyptic number.

It is an amenable number.

30303221 is a deficient number, since it is larger than the sum of its proper divisors (2556121).

30303221 is an frugal number, since it uses more digits than its factorization.

30303221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 30303221 is about 5504.8361465170. The cubic root of 30303221 is about 311.7666078615.

Adding to 30303221 its reverse (12230303), we get a palindrome (42533524).

The spelling of 30303221 in words is "thirty million, three hundred three thousand, two hundred twenty-one".