42245867521 has 12 divisors (see below), whose sum is σ = 50007506836. Its totient is φ = 35451076320.

The previous prime is 42245867513. The next prime is 42245867539. The reversal of 42245867521 is 12576854224.

It can be written as a sum of positive squares in 2 ways, for example, as 19750367296 + 22495500225 = 140536^2 + 149985^2 .

It is not a de Polignac number, because 42245867521 - 2³ = 42245867513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42245867501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13426866 + ... + 13430011.

Almost surely, 2^42245867521 is an apocalyptic number.

It is an amenable number.

42245867521 is a deficient number, since it is larger than the sum of its proper divisors (7761639315).

42245867521 is a wasteful number, since it uses less digits than its factorization.

42245867521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26856912 (or 26856901 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 46.

The spelling of 42245867521 in words is "forty-two billion, two hundred forty-five million, eight hundred sixty-seven thousand, five hundred twenty-one".