20323123222991 has 2 divisors, whose sum is σ = 20323123222992. Its totient is φ = 20323123222990.

The previous prime is 20323123222951. The next prime is 20323123223027. The reversal of 20323123222991 is 19922232132302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20323123222991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20323123222951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161561611495 + 10161561611496.

It is an arithmetic number, because the mean of its divisors is an integer number (10161561611496).

Almost surely, 2^{20323123222991} is an apocalyptic number.

20323123222991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323123222991 is an equidigital number, since it uses as much as digits as its factorization.

20323123222991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 20323123222991 in words is "twenty trillion, three hundred twenty-three billion, one hundred twenty-three million, two hundred twenty-two thousand, nine hundred ninety-one".