30201221 has 2 divisors, whose sum is σ = 30201222.
Its totient is φ = 30201220.
The previous prime is 30201217. The next prime is 30201229. The reversal of 30201221 is 12210203.
Adding to 30201221 its reverse (12210203), we get a palindrome (42411424).
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., 27984100 + 2217121 = 5290^2 + 1489^2
It is an emirp because it is prime and its reverse (12210203) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 30201221 - 22 = 30201217 is a prime.
It is a super-2 number, since 2×302012212 = 1824227499781682, which contains 22 as substring.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (30201229) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15100610 + 15100611.
It is an arithmetic number, because the mean of its divisors is an integer number (15100611).
Almost surely, 230201221 is an apocalyptic number.
It is an amenable number.
30201221 is a deficient number, since it is larger than the sum of its proper divisors (1).
30201221 is an equidigital number, since it uses as much as digits as its factorization.
30201221 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 30201221 is about 5495.5637563402.
The cubic root of 30201221 is about 311.4164147202.
The spelling of 30201221 in words is "thirty million, two hundred one thousand, two hundred twenty-one".