4242524021 has 2 divisors, whose sum is σ = 4242524022. Its totient is φ = 4242524020.

The previous prime is 4242523993. The next prime is 4242524023. The reversal of 4242524021 is 1204252424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4191915025 + 50608996 = 64745^2 + 7114^2 .

It is a cyclic number.

It is not a de Polignac number, because 4242524021 - 2¹⁰ = 4242522997 is a prime.

It is a Sophie Germain prime.

Together with 4242524023, it forms a pair of twin primes.

It is a Chen 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 (4242524023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121262010 + 2121262011.

It is an arithmetic number, because the mean of its divisors is an integer number (2121262011).

Almost surely, 2^4242524021 is an apocalyptic number.

It is an amenable number.

4242524021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4242524021 is an equidigital number, since it uses as much as digits as its factorization.

4242524021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 4242524021 is about 65134.6606731009. The cubic root of 4242524021 is about 1618.8555679058.

Adding to 4242524021 its reverse (1204252424), we get a palindrome (5446776445).

The spelling of 4242524021 in words is "four billion, two hundred forty-two million, five hundred twenty-four thousand, twenty-one".