2126911806869 has 2 divisors, whose sum is σ = 2126911806870. Its totient is φ = 2126911806868.

The previous prime is 2126911806793. The next prime is 2126911806937. The reversal of 2126911806869 is 9686081196212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1878023568100 + 248888238769 = 1370410^2 + 498887^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126911806869 - 2²⁴ = 2126895029653 is a prime.

It is a super-2 number, since 2×2126911806869² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2126911800869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063455903434 + 1063455903435.

It is an arithmetic number, because the mean of its divisors is an integer number (1063455903435).

Almost surely, 2^{2126911806869} is an apocalyptic number.

It is an amenable number.

2126911806869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126911806869 is an equidigital number, since it uses as much as digits as its factorization.

2126911806869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 59.

The spelling of 2126911806869 in words is "two trillion, one hundred twenty-six billion, nine hundred eleven million, eight hundred six thousand, eight hundred sixty-nine".