1240243321 has 2 divisors, whose sum is σ = 1240243322. Its totient is φ = 1240243320.

The previous prime is 1240243309. The next prime is 1240243331. The reversal of 1240243321 is 1233420421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 998876025 + 241367296 = 31605^2 + 15536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240243321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1240243292 and 1240243301.

It is not a weakly prime, because it can be changed into another prime (1240243331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620121660 + 620121661.

It is an arithmetic number, because the mean of its divisors is an integer number (620121661).

Almost surely, 2^1240243321 is an apocalyptic number.

It is an amenable number.

1240243321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240243321 is an equidigital number, since it uses as much as digits as its factorization.

1240243321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1240243321 is about 35217.0884798843. The cubic root of 1240243321 is about 1074.4073375680.

Adding to 1240243321 its reverse (1233420421), we get a palindrome (2473663742).

The spelling of 1240243321 in words is "one billion, two hundred forty million, two hundred forty-three thousand, three hundred twenty-one".