240842221 has 2 divisors, whose sum is σ = 240842222. Its totient is φ = 240842220.

The previous prime is 240842209. The next prime is 240842227. The reversal of 240842221 is 122248042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227255625 + 13586596 = 15075^2 + 3686^2 .

It is a cyclic number.

It is not a de Polignac number, because 240842221 - 2⁷ = 240842093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240842227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120421110 + 120421111.

It is an arithmetic number, because the mean of its divisors is an integer number (120421111).

Almost surely, 2^240842221 is an apocalyptic number.

It is an amenable number.

240842221 is a deficient number, since it is larger than the sum of its proper divisors (1).

240842221 is an equidigital number, since it uses as much as digits as its factorization.

240842221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 240842221 is about 15519.0921448389. The cubic root of 240842221 is about 622.1725904160.

The spelling of 240842221 in words is "two hundred forty million, eight hundred forty-two thousand, two hundred twenty-one".