9240221 has 2 divisors, whose sum is σ = 9240222. Its totient is φ = 9240220.

The previous prime is 9240173. The next prime is 9240223. The reversal of 9240221 is 1220429.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9084196 + 156025 = 3014^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 9240221 - 2⁶ = 9240157 is a prime.

It is a Sophie Germain prime.

Together with 9240223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9240193 and 9240202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9240223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4620110 + 4620111.

It is an arithmetic number, because the mean of its divisors is an integer number (4620111).

Almost surely, 2^9240221 is an apocalyptic number.

It is an amenable number.

9240221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9240221 is an equidigital number, since it uses as much as digits as its factorization.

9240221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 9240221 is about 3039.7731823279. The cubic root of 9240221 is about 209.8428226751.

The spelling of 9240221 in words is "nine million, two hundred forty thousand, two hundred twenty-one".