42810421 has 2 divisors, whose sum is σ = 42810422. Its totient is φ = 42810420.

The previous prime is 42810377. The next prime is 42810457. The reversal of 42810421 is 12401824.

42810421 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., 42432196 + 378225 = 6514^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 42810421 - 2¹¹ = 42808373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42810392 and 42810401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42810461) 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, 21405210 + 21405211.

It is an arithmetic number, because the mean of its divisors is an integer number (21405211).

Almost surely, 2^42810421 is an apocalyptic number.

It is an amenable number.

42810421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42810421 is an equidigital number, since it uses as much as digits as its factorization.

42810421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 42810421 is about 6542.9672932088. The cubic root of 42810421 is about 349.8241865294.

The spelling of 42810421 in words is "forty-two million, eight hundred ten thousand, four hundred twenty-one".