240302921 has 2 divisors, whose sum is σ = 240302922. Its totient is φ = 240302920.

The previous prime is 240302891. The next prime is 240302947. The reversal of 240302921 is 129203042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189337600 + 50965321 = 13760^2 + 7139^2 .

It is a cyclic number.

It is not a de Polignac number, because 240302921 - 2⁶ = 240302857 is a prime.

It is a super-2 number, since 2×240302921² = 115490987682264482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (240302971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120151460 + 120151461.

It is an arithmetic number, because the mean of its divisors is an integer number (120151461).

Almost surely, 2^240302921 is an apocalyptic number.

It is an amenable number.

240302921 is a deficient number, since it is larger than the sum of its proper divisors (1).

240302921 is an equidigital number, since it uses as much as digits as its factorization.

240302921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 240302921 is about 15501.7070350333. The cubic root of 240302921 is about 621.7078484827.

Adding to 240302921 its reverse (129203042), we get a palindrome (369505963).

The spelling of 240302921 in words is "two hundred forty million, three hundred two thousand, nine hundred twenty-one".