42404024521 has 2 divisors, whose sum is σ = 42404024522. Its totient is φ = 42404024520.

The previous prime is 42404024519. The next prime is 42404024567. The reversal of 42404024521 is 12542040424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42403046400 + 978121 = 205920^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 42404024521 - 2¹ = 42404024519 is a prime.

Together with 42404024519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 42404024521.

It is not a weakly prime, because it can be changed into another prime (42404024501) 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, 21202012260 + 21202012261.

It is an arithmetic number, because the mean of its divisors is an integer number (21202012261).

Almost surely, 2^42404024521 is an apocalyptic number.

It is an amenable number.

42404024521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42404024521 is an equidigital number, since it uses as much as digits as its factorization.

42404024521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10240, while the sum is 28.

Adding to 42404024521 its reverse (12542040424), we get a palindrome (54946064945).

The spelling of 42404024521 in words is "forty-two billion, four hundred four million, twenty-four thousand, five hundred twenty-one".