1240321253209 has 2 divisors, whose sum is σ = 1240321253210. Its totient is φ = 1240321253208.

The previous prime is 1240321253179. The next prime is 1240321253251. The reversal of 1240321253209 is 9023521230421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1064089213209 + 176232040000 = 1031547^2 + 419800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240321253209 - 2⁹ = 1240321252697 is a prime.

It is a super-2 number, since 2×1240321253209² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1240321253609) 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, 620160626604 + 620160626605.

It is an arithmetic number, because the mean of its divisors is an integer number (620160626605).

Almost surely, 2^{1240321253209} is an apocalyptic number.

It is an amenable number.

1240321253209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240321253209 is an equidigital number, since it uses as much as digits as its factorization.

1240321253209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 1240321253209 in words is "one trillion, two hundred forty billion, three hundred twenty-one million, two hundred fifty-three thousand, two hundred nine".