42055721 has 8 divisors (see below), whose sum is σ = 44371200. Its totient is φ = 39750480.

The previous prime is 42055711. The next prime is 42055723. The reversal of 42055721 is 12755024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42055721 - 2¹⁰ = 42054697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42055723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6791 + ... + 11411.

It is an arithmetic number, because the mean of its divisors is an integer number (5546400).

Almost surely, 2^42055721 is an apocalyptic number.

It is an amenable number.

42055721 is a deficient number, since it is larger than the sum of its proper divisors (2315479).

42055721 is a wasteful number, since it uses less digits than its factorization.

42055721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5119.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 42055721 is about 6485.0382419844. The cubic root of 42055721 is about 347.7563169404.

The spelling of 42055721 in words is "forty-two million, fifty-five thousand, seven hundred twenty-one".