42021444 has 12 divisors (see below), whose sum is σ = 98050064. Its totient is φ = 14007144.

The previous prime is 42021401. The next prime is 42021509. The reversal of 42021444 is 44412024.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 42021444.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750882 + ... + 1750905.

Almost surely, 2^42021444 is an apocalyptic number.

It is an amenable number.

42021444 is an abundant number, since it is smaller than the sum of its proper divisors (56028620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42021444 is a wasteful number, since it uses less digits than its factorization.

42021444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501794 (or 3501792 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 42021444 is about 6482.3949278025. The cubic root of 42021444 is about 347.6618130863.

Adding to 42021444 its reverse (44412024), we get a palindrome (86433468).

The spelling of 42021444 in words is "forty-two million, twenty-one thousand, four hundred forty-four".