1321894487289 has 16 divisors (see below), whose sum is σ = 1789094104832. Its totient is φ = 867982780368.

The previous prime is 1321894487227. The next prime is 1321894487321. The reversal of 1321894487289 is 9827844981231.

It is not a de Polignac number, because 1321894487289 - 2¹³ = 1321894479097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321894487219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 905742 + ... + 1861224.

It is an arithmetic number, because the mean of its divisors is an integer number (111818381552).

Almost surely, 2^{1321894487289} is an apocalyptic number.

It is an amenable number.

1321894487289 is a deficient number, since it is larger than the sum of its proper divisors (467199617543).

1321894487289 is an equidigital number, since it uses as much as digits as its factorization.

1321894487289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962436.

The product of its digits is 55738368, while the sum is 66.

The spelling of 1321894487289 in words is "one trillion, three hundred twenty-one billion, eight hundred ninety-four million, four hundred eighty-seven thousand, two hundred eighty-nine".