42531242521 has 2 divisors, whose sum is σ = 42531242522. Its totient is φ = 42531242520.

The previous prime is 42531242497. The next prime is 42531242527. The reversal of 42531242521 is 12524213524.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39199644121 + 3331598400 = 197989^2 + 57720^2 .

It is a cyclic number.

It is not a de Polignac number, because 42531242521 - 2⁹ = 42531242009 is a prime.

It is a super-3 number, since 3×42531242521³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (42531242527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21265621260 + 21265621261.

It is an arithmetic number, because the mean of its divisors is an integer number (21265621261).

Almost surely, 2^42531242521 is an apocalyptic number.

It is an amenable number.

42531242521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42531242521 is an equidigital number, since it uses as much as digits as its factorization.

42531242521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 31.

The spelling of 42531242521 in words is "forty-two billion, five hundred thirty-one million, two hundred forty-two thousand, five hundred twenty-one".