42442421 has 16 divisors (see below), whose sum is σ = 52617600. Its totient is φ = 33400320.

The previous prime is 42442403. The next prime is 42442427. The reversal of 42442421 is 12424424.

It is a cyclic number.

It is not a de Polignac number, because 42442421 - 2⁶ = 42442357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42442427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530 + ... + 9228.

It is an arithmetic number, because the mean of its divisors is an integer number (3288600).

Almost surely, 2^42442421 is an apocalyptic number.

42442421 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42442421 is a deficient number, since it is larger than the sum of its proper divisors (10175179).

42442421 is a wasteful number, since it uses less digits than its factorization.

42442421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8764.

The product of its digits is 2048, while the sum is 23.

The square root of 42442421 is about 6514.7848007436. The cubic root of 42442421 is about 348.8189332870.

Adding to 42442421 its reverse (12424424), we get a palindrome (54866845).

The spelling of 42442421 in words is "forty-two million, four hundred forty-two thousand, four hundred twenty-one".