42630421 has 2 divisors, whose sum is σ = 42630422. Its totient is φ = 42630420.

The previous prime is 42630409. The next prime is 42630437. The reversal of 42630421 is 12403624.

It is a happy number.

42630421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26316900 + 16313521 = 5130^2 + 4039^2 .

It is a cyclic number.

It is not a de Polignac number, because 42630421 - 2¹⁷ = 42499349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42630392 and 42630401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42630451) 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, 21315210 + 21315211.

It is an arithmetic number, because the mean of its divisors is an integer number (21315211).

Almost surely, 2^42630421 is an apocalyptic number.

It is an amenable number.

42630421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42630421 is an equidigital number, since it uses as much as digits as its factorization.

42630421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 42630421 is about 6529.1975770381. The cubic root of 42630421 is about 349.3332094048. Note that the first 3 decimals are identical.

The spelling of 42630421 in words is "forty-two million, six hundred thirty thousand, four hundred twenty-one".