2143985221289 has 2 divisors, whose sum is σ = 2143985221290. Its totient is φ = 2143985221288.

The previous prime is 2143985221253. The next prime is 2143985221333. The reversal of 2143985221289 is 9821225893412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2135374309264 + 8610912025 = 1461292^2 + 92795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143985221289 - 2²⁴ = 2143968444073 is a prime.

It is not a weakly prime, because it can be changed into another prime (2143985221789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071992610644 + 1071992610645.

It is an arithmetic number, because the mean of its divisors is an integer number (1071992610645).

Almost surely, 2^{2143985221289} is an apocalyptic number.

It is an amenable number.

2143985221289 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143985221289 is an equidigital number, since it uses as much as digits as its factorization.

2143985221289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 56.

The spelling of 2143985221289 in words is "two trillion, one hundred forty-three billion, nine hundred eighty-five million, two hundred twenty-one thousand, two hundred eighty-nine".