2055798800021 has 2 divisors, whose sum is σ = 2055798800022. Its totient is φ = 2055798800020.

The previous prime is 2055798799933. The next prime is 2055798800023. The reversal of 2055798800021 is 1200088975502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1097580999025 + 958217800996 = 1047655^2 + 978886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2055798800021 is a prime.

It is a Sophie Germain prime.

Together with 2055798800023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2055798800023) 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, 1027899400010 + 1027899400011.

It is an arithmetic number, because the mean of its divisors is an integer number (1027899400011).

Almost surely, 2^{2055798800021} is an apocalyptic number.

It is an amenable number.

2055798800021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2055798800021 is an equidigital number, since it uses as much as digits as its factorization.

2055798800021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 2055798800021 in words is "two trillion, fifty-five billion, seven hundred ninety-eight million, eight hundred thousand, twenty-one".