42021751 has 8 divisors (see below), whose sum is σ = 43256160. Its totient is φ = 40792608.

The previous prime is 42021743. The next prime is 42021779. The reversal of 42021751 is 15712024.

It is a happy number.

42021751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42021751 - 2³ = 42021743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19590 + ... + 21628.

It is an arithmetic number, because the mean of its divisors is an integer number (5407020).

Almost surely, 2^42021751 is an apocalyptic number.

42021751 is a deficient number, since it is larger than the sum of its proper divisors (1234409).

42021751 is a wasteful number, since it uses less digits than its factorization.

42021751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 42021751 is about 6482.4186072792. The cubic root of 42021751 is about 347.6626597327.

Adding to 42021751 its reverse (15712024), we get a palindrome (57733775).

The spelling of 42021751 in words is "forty-two million, twenty-one thousand, seven hundred fifty-one".