42569495021 has 2 divisors, whose sum is σ = 42569495022. Its totient is φ = 42569495020.

The previous prime is 42569495011. The next prime is 42569495057. The reversal of 42569495021 is 12059496524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37100152996 + 5469342025 = 192614^2 + 73955^2 .

It is a cyclic number.

It is not a de Polignac number, because 42569495021 - 2¹⁸ = 42569232877 is a prime.

It is a Sophie Germain 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 (42569495011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21284747510 + 21284747511.

It is an arithmetic number, because the mean of its divisors is an integer number (21284747511).

Almost surely, 2^42569495021 is an apocalyptic number.

It is an amenable number.

42569495021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42569495021 is an equidigital number, since it uses as much as digits as its factorization.

42569495021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 42569495021 in words is "forty-two billion, five hundred sixty-nine million, four hundred ninety-five thousand, twenty-one".