2005043345021 has 2 divisors, whose sum is σ = 2005043345022. Its totient is φ = 2005043345020.

The previous prime is 2005043345017. The next prime is 2005043345069. The reversal of 2005043345021 is 1205433405002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2004246129796 + 797215225 = 1415714^2 + 28235^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005043345021 - 2² = 2005043345017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2005043335021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002521672510 + 1002521672511.

It is an arithmetic number, because the mean of its divisors is an integer number (1002521672511).

Almost surely, 2^{2005043345021} is an apocalyptic number.

It is an amenable number.

2005043345021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005043345021 is an equidigital number, since it uses as much as digits as its factorization.

2005043345021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 29.

The spelling of 2005043345021 in words is "two trillion, five billion, forty-three million, three hundred forty-five thousand, twenty-one".