2081721799 has 2 divisors, whose sum is σ = 2081721800. Its totient is φ = 2081721798.

The previous prime is 2081721769. The next prime is 2081721857. The reversal of 2081721799 is 9971271802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2081721799 - 2⁵ = 2081721767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081721749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040860899 + 1040860900.

It is an arithmetic number, because the mean of its divisors is an integer number (1040860900).

Almost surely, 2^2081721799 is an apocalyptic number.

2081721799 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081721799 is an equidigital number, since it uses as much as digits as its factorization.

2081721799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 2081721799 is about 45625.8895694100. The cubic root of 2081721799 is about 1276.8529866508.

The spelling of 2081721799 in words is "two billion, eighty-one million, seven hundred twenty-one thousand, seven hundred ninety-nine".