20123111233943 has 2 divisors, whose sum is σ = 20123111233944. Its totient is φ = 20123111233942.

The previous prime is 20123111233871. The next prime is 20123111234021. The reversal of 20123111233943 is 34933211132102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123111233943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123111233843) 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, 10061555616971 + 10061555616972.

It is an arithmetic number, because the mean of its divisors is an integer number (10061555616972).

Almost surely, 2^{20123111233943} is an apocalyptic number.

20123111233943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123111233943 is an equidigital number, since it uses as much as digits as its factorization.

20123111233943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 20123111233943 in words is "twenty trillion, one hundred twenty-three billion, one hundred eleven million, two hundred thirty-three thousand, nine hundred forty-three".