1321234430909 has 2 divisors, whose sum is σ = 1321234430910. Its totient is φ = 1321234430908.

The previous prime is 1321234430849. The next prime is 1321234430933. The reversal of 1321234430909 is 9090344321231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1263495146809 + 57739284100 = 1124053^2 + 240290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321234430909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321234430969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660617215454 + 660617215455.

It is an arithmetic number, because the mean of its divisors is an integer number (660617215455).

Almost surely, 2^{1321234430909} is an apocalyptic number.

It is an amenable number.

1321234430909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321234430909 is an equidigital number, since it uses as much as digits as its factorization.

1321234430909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 1321234430909 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-four million, four hundred thirty thousand, nine hundred nine".