2123509197269 has 2 divisors, whose sum is σ = 2123509197270. Its totient is φ = 2123509197268.

The previous prime is 2123509197181. The next prime is 2123509197317. The reversal of 2123509197269 is 9627919053212.

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., 2048797175044 + 74712022225 = 1431362^2 + 273335^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123509197269 - 2⁸ = 2123509197013 is a prime.

It is a super-2 number, since 2×2123509197269² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123509194269) 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 as a sum of consecutive naturals, namely, 1061754598634 + 1061754598635.

It is an arithmetic number, because the mean of its divisors is an integer number (1061754598635).

Almost surely, 2^{2123509197269} is an apocalyptic number.

It is an amenable number.

2123509197269 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123509197269 is an equidigital number, since it uses as much as digits as its factorization.

2123509197269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 2123509197269 in words is "two trillion, one hundred twenty-three billion, five hundred nine million, one hundred ninety-seven thousand, two hundred sixty-nine".