2100200078939 has 2 divisors, whose sum is σ = 2100200078940. Its totient is φ = 2100200078938.

The previous prime is 2100200078923. The next prime is 2100200078941. The reversal of 2100200078939 is 9398700020012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100200078939 - 2⁴ = 2100200078923 is a prime.

Together with 2100200078941, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100200078896 and 2100200078905.

It is not a weakly prime, because it can be changed into another prime (2100200071939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050100039469 + 1050100039470.

It is an arithmetic number, because the mean of its divisors is an integer number (1050100039470).

Almost surely, 2^{2100200078939} is an apocalyptic number.

2100200078939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100200078939 is an equidigital number, since it uses as much as digits as its factorization.

2100200078939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 2100200078939 in words is "two trillion, one hundred billion, two hundred million, seventy-eight thousand, nine hundred thirty-nine".