240221321 has 2 divisors, whose sum is σ = 240221322. Its totient is φ = 240221320.

The previous prime is 240221309. The next prime is 240221323. The reversal of 240221321 is 123122042.

240221321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120209296 + 120012025 = 10964^2 + 10955^2 .

It is a cyclic number.

It is not a de Polignac number, because 240221321 - 2⁶ = 240221257 is a prime.

It is a Sophie Germain prime.

Together with 240221323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 240221321.

It is not a weakly prime, because it can be changed into another prime (240221323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120110660 + 120110661.

It is an arithmetic number, because the mean of its divisors is an integer number (120110661).

Almost surely, 2^240221321 is an apocalyptic number.

It is an amenable number.

240221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

240221321 is an equidigital number, since it uses as much as digits as its factorization.

240221321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 240221321 is about 15499.0748433576. The cubic root of 240221321 is about 621.6374691137.

Adding to 240221321 its reverse (123122042), we get a palindrome (363343363).

The spelling of 240221321 in words is "two hundred forty million, two hundred twenty-one thousand, three hundred twenty-one".