20310120643999 has 2 divisors, whose sum is σ = 20310120644000. Its totient is φ = 20310120643998.

The previous prime is 20310120643997. The next prime is 20310120644017. The reversal of 20310120643999 is 99934602101302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20310120643999 - 2¹ = 20310120643997 is a prime.

Together with 20310120643997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310120643993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155060321999 + 10155060322000.

It is an arithmetic number, because the mean of its divisors is an integer number (10155060322000).

Almost surely, 2^{20310120643999} is an apocalyptic number.

20310120643999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310120643999 is an equidigital number, since it uses as much as digits as its factorization.

20310120643999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 49.

The spelling of 20310120643999 in words is "twenty trillion, three hundred ten billion, one hundred twenty million, six hundred forty-three thousand, nine hundred ninety-nine".