4045121021857 has 2 divisors, whose sum is σ = 4045121021858. Its totient is φ = 4045121021856.

The previous prime is 4045121021813. The next prime is 4045121021867. The reversal of 4045121021857 is 7581201215404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3563490573841 + 481630448016 = 1887721^2 + 693996^2 .

It is a cyclic number.

It is not a de Polignac number, because 4045121021857 - 2⁷ = 4045121021729 is a prime.

It is not a weakly prime, because it can be changed into another prime (4045121021867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2022560510928 + 2022560510929.

It is an arithmetic number, because the mean of its divisors is an integer number (2022560510929).

Almost surely, 2^{4045121021857} is an apocalyptic number.

It is an amenable number.

4045121021857 is a deficient number, since it is larger than the sum of its proper divisors (1).

4045121021857 is an equidigital number, since it uses as much as digits as its factorization.

4045121021857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 89600, while the sum is 40.

The spelling of 4045121021857 in words is "four trillion, forty-five billion, one hundred twenty-one million, twenty-one thousand, eight hundred fifty-seven".