42302521 has 2 divisors, whose sum is σ = 42302522. Its totient is φ = 42302520.

The previous prime is 42302473. The next prime is 42302539. The reversal of 42302521 is 12520324.

42302521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26214400 + 16088121 = 5120^2 + 4011^2 .

It is a cyclic number.

It is not a de Polignac number, because 42302521 - 2¹⁵ = 42269753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42302591) 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 as a sum of consecutive naturals, namely, 21151260 + 21151261.

It is an arithmetic number, because the mean of its divisors is an integer number (21151261).

Almost surely, 2^42302521 is an apocalyptic number.

It is an amenable number.

42302521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42302521 is an equidigital number, since it uses as much as digits as its factorization.

42302521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 42302521 is about 6504.0388221474. The cubic root of 42302521 is about 348.4352488785.

Adding to 42302521 its reverse (12520324), we get a palindrome (54822845).

The spelling of 42302521 in words is "forty-two million, three hundred two thousand, five hundred twenty-one".