19955800213 has 2 divisors, whose sum is σ = 19955800214. Its totient is φ = 19955800212.

The previous prime is 19955800129. The next prime is 19955800231. The reversal of 19955800213 is 31200855991.

It is a happy number.

Together with next prime (19955800231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14691136849 + 5264663364 = 121207^2 + 72558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19955800213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19955800213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19955800273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977900106 + 9977900107.

It is an arithmetic number, because the mean of its divisors is an integer number (9977900107).

Almost surely, 2^19955800213 is an apocalyptic number.

It is an amenable number.

19955800213 is a deficient number, since it is larger than the sum of its proper divisors (1).

19955800213 is an equidigital number, since it uses as much as digits as its factorization.

19955800213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 43.

The spelling of 19955800213 in words is "nineteen billion, nine hundred fifty-five million, eight hundred thousand, two hundred thirteen".