42066621 has 20 divisors (see below), whose sum is σ = 63016800. Its totient is φ = 27965736.

The previous prime is 42066593. The next prime is 42066643. The reversal of 42066621 is 12666024.

It is a happy number.

42066621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42066621 - 2¹⁴ = 42050237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42066671) 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 in 19 ways as a sum of consecutive naturals, for example, 49720 + ... + 50558.

It is an arithmetic number, because the mean of its divisors is an integer number (3150840).

Almost surely, 2^42066621 is an apocalyptic number.

It is an amenable number.

42066621 is a deficient number, since it is larger than the sum of its proper divisors (20950179).

42066621 is an equidigital number, since it uses as much as digits as its factorization.

42066621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470 (or 1461 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 42066621 is about 6485.8785835074. The cubic root of 42066621 is about 347.7863581677.

The spelling of 42066621 in words is "forty-two million, sixty-six thousand, six hundred twenty-one".