30210221 has 2 divisors, whose sum is σ = 30210222. Its totient is φ = 30210220.

The previous prime is 30210217. The next prime is 30210227. The reversal of 30210221 is 12201203.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 6832996 = 4835^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 30210221 - 2² = 30210217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30210227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15105110 + 15105111.

It is an arithmetic number, because the mean of its divisors is an integer number (15105111).

Almost surely, 2^30210221 is an apocalyptic number.

It is an amenable number.

30210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30210221 is an equidigital number, since it uses as much as digits as its factorization.

30210221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 30210221 is about 5496.3825376333. The cubic root of 30210221 is about 311.4473458027.

Adding to 30210221 its reverse (12201203), we get a palindrome (42411424).

The spelling of 30210221 in words is "thirty million, two hundred ten thousand, two hundred twenty-one".