30903221 has 2 divisors, whose sum is σ = 30903222. Its totient is φ = 30903220.

The previous prime is 30903211. The next prime is 30903233. The reversal of 30903221 is 12230903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 12327121 = 4310^2 + 3511^2 .

It is an emirp because it is prime and its reverse (12230903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30903221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30903193 and 30903202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30903211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15451610 + 15451611.

It is an arithmetic number, because the mean of its divisors is an integer number (15451611).

Almost surely, 2^30903221 is an apocalyptic number.

It is an amenable number.

30903221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30903221 is an equidigital number, since it uses as much as digits as its factorization.

30903221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 30903221 is about 5559.0665583351. The cubic root of 30903221 is about 313.8108215818.

The spelling of 30903221 in words is "thirty million, nine hundred three thousand, two hundred twenty-one".