42021056 has 56 divisors (see below), whose sum is σ = 103973376. Its totient is φ = 16369920.

The previous prime is 42021043. The next prime is 42021071. The reversal of 42021056 is 65012024.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 665 + ... + 9191.

Almost surely, 2^42021056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42021056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51986688).

42021056 is an abundant number, since it is smaller than the sum of its proper divisors (61952320).

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

42021056 is a wasteful number, since it uses less digits than its factorization.

42021056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8557 (or 8547 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 42021056 is about 6482.3650005226. The cubic root of 42021056 is about 347.6607430516.

The spelling of 42021056 in words is "forty-two million, twenty-one thousand, fifty-six".