4042531021 has 2 divisors, whose sum is σ = 4042531022. Its totient is φ = 4042531020.

The previous prime is 4042530983. The next prime is 4042531039. The reversal of 4042531021 is 1201352404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4001954121 + 40576900 = 63261^2 + 6370^2 .

It is a cyclic number.

It is not a de Polignac number, because 4042531021 - 2⁹ = 4042530509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4042530983 and 4042531001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4042531321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021265510 + 2021265511.

It is an arithmetic number, because the mean of its divisors is an integer number (2021265511).

Almost surely, 2^4042531021 is an apocalyptic number.

It is an amenable number.

4042531021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4042531021 is an equidigital number, since it uses as much as digits as its factorization.

4042531021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 4042531021 is about 63580.9013855576. The cubic root of 4042531021 is about 1593.0073773980.

Adding to 4042531021 its reverse (1201352404), we get a palindrome (5243883425).

The spelling of 4042531021 in words is "four billion, forty-two million, five hundred thirty-one thousand, twenty-one".