2123231013209 has 2 divisors, whose sum is σ = 2123231013210. Its totient is φ = 2123231013208.

The previous prime is 2123231013203. The next prime is 2123231013229. The reversal of 2123231013209 is 9023101323212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1400561003209 + 722670010000 = 1183453^2 + 850100^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123231013209 - 2⁸ = 2123231012953 is a prime.

It is not a weakly prime, because it can be changed into another prime (2123231013203) 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, 1061615506604 + 1061615506605.

It is an arithmetic number, because the mean of its divisors is an integer number (1061615506605).

Almost surely, 2^{2123231013209} is an apocalyptic number.

It is an amenable number.

2123231013209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123231013209 is an equidigital number, since it uses as much as digits as its factorization.

2123231013209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 2123231013209 in words is "two trillion, one hundred twenty-three billion, two hundred thirty-one million, thirteen thousand, two hundred nine".