20550368321191 has 2 divisors, whose sum is σ = 20550368321192. Its totient is φ = 20550368321190.

The previous prime is 20550368321141. The next prime is 20550368321257. The reversal of 20550368321191 is 19112386305502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20550368321191 - 2⁹ = 20550368320679 is a prime.

It is a super-2 number, since 2×20550368321191² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20550368321141) 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, 10275184160595 + 10275184160596.

It is an arithmetic number, because the mean of its divisors is an integer number (10275184160596).

Almost surely, 2^{20550368321191} is an apocalyptic number.

20550368321191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20550368321191 is an equidigital number, since it uses as much as digits as its factorization.

20550368321191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 20550368321191 in words is "twenty trillion, five hundred fifty billion, three hundred sixty-eight million, three hundred twenty-one thousand, one hundred ninety-one".