1321131012009 has 36 divisors (see below), whose sum is σ = 1873172626416. Its totient is φ = 828177903344.

The previous prime is 1321131011999. The next prime is 1321131012011. The reversal of 1321131012009 is 9002101311231.

It is a de Polignac number, because none of the positive numbers 2^k-1321131012009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321131012009.

It is not an unprimeable number, because it can be changed into a prime (1321131012709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5404774 + ... + 5643920.

It is an arithmetic number, because the mean of its divisors is an integer number (52032572956).

Almost surely, 2^{1321131012009} is an apocalyptic number.

It is an amenable number.

1321131012009 is a deficient number, since it is larger than the sum of its proper divisors (552041614407).

1321131012009 is an equidigital number, since it uses as much as digits as its factorization.

1321131012009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239314 (or 239232 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The spelling of 1321131012009 in words is "one trillion, three hundred twenty-one billion, one hundred thirty-one million, twelve thousand, nine".