42059721 has 24 divisors (see below), whose sum is σ = 62265280. Its totient is φ = 25233120.

The previous prime is 42059707. The next prime is 42059723. The reversal of 42059721 is 12795024.

It is not a de Polignac number, because 42059721 - 2⁹ = 42059209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42059723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39036 + ... + 40098.

Almost surely, 2^42059721 is an apocalyptic number.

It is an amenable number.

42059721 is a deficient number, since it is larger than the sum of its proper divisors (20205559).

42059721 is a wasteful number, since it uses less digits than its factorization.

42059721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 42059721 is about 6485.3466368422. The cubic root of 42059721 is about 347.7673418469.

The spelling of 42059721 in words is "forty-two million, fifty-nine thousand, seven hundred twenty-one".