2101779931399 has 2 divisors, whose sum is σ = 2101779931400. Its totient is φ = 2101779931398.

The previous prime is 2101779931373. The next prime is 2101779931403. The reversal of 2101779931399 is 9931399771012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101779931399 - 2²³ = 2101771542791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101779931309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050889965699 + 1050889965700.

It is an arithmetic number, because the mean of its divisors is an integer number (1050889965700).

Almost surely, 2^{2101779931399} is an apocalyptic number.

2101779931399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101779931399 is an equidigital number, since it uses as much as digits as its factorization.

2101779931399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5786802, while the sum is 61.

The spelling of 2101779931399 in words is "two trillion, one hundred one billion, seven hundred seventy-nine million, nine hundred thirty-one thousand, three hundred ninety-nine".