2126389308889 has 2 divisors, whose sum is σ = 2126389308890. Its totient is φ = 2126389308888.

The previous prime is 2126389308767. The next prime is 2126389308893. The reversal of 2126389308889 is 9888039836212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1769631575625 + 356757733264 = 1330275^2 + 597292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2126389308889 is a prime.

It is not a weakly prime, because it can be changed into another prime (2126389308089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063194654444 + 1063194654445.

It is an arithmetic number, because the mean of its divisors is an integer number (1063194654445).

Almost surely, 2^{2126389308889} is an apocalyptic number.

It is an amenable number.

2126389308889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126389308889 is an equidigital number, since it uses as much as digits as its factorization.

2126389308889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71663616, while the sum is 67.

The spelling of 2126389308889 in words is "two trillion, one hundred twenty-six billion, three hundred eighty-nine million, three hundred eight thousand, eight hundred eighty-nine".