240520321 has 2 divisors, whose sum is σ = 240520322. Its totient is φ = 240520320.

The previous prime is 240520261. The next prime is 240520333. The reversal of 240520321 is 123025042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208484721 + 32035600 = 14439^2 + 5660^2 .

It is a cyclic number.

It is not a de Polignac number, because 240520321 - 2¹¹ = 240518273 is a prime.

It is not a weakly prime, because it can be changed into another prime (240520421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120260160 + 120260161.

It is an arithmetic number, because the mean of its divisors is an integer number (120260161).

Almost surely, 2^240520321 is an apocalyptic number.

It is an amenable number.

240520321 is a deficient number, since it is larger than the sum of its proper divisors (1).

240520321 is an equidigital number, since it uses as much as digits as its factorization.

240520321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 240520321 is about 15508.7175807673. The cubic root of 240520321 is about 621.8952765659.

Adding to 240520321 its reverse (123025042), we get a palindrome (363545363).

The spelling of 240520321 in words is "two hundred forty million, five hundred twenty thousand, three hundred twenty-one".