42187321 has 8 divisors (see below), whose sum is σ = 46204704. Its totient is φ = 38200320.

The previous prime is 42187303. The next prime is 42187331. The reversal of 42187321 is 12378124.

42187321 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 42187321 - 2¹³ = 42179129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42187321.

It is not an unprimeable number, because it can be changed into a prime (42187331) 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, 4635 + ... + 10288.

It is an arithmetic number, because the mean of its divisors is an integer number (5775588).

Almost surely, 2^42187321 is an apocalyptic number.

It is an amenable number.

42187321 is a deficient number, since it is larger than the sum of its proper divisors (4017383).

42187321 is a wasteful number, since it uses less digits than its factorization.

42187321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15191.

The product of its digits is 2688, while the sum is 28.

The square root of 42187321 is about 6495.1767489422. The cubic root of 42187321 is about 348.1186701680.

The spelling of 42187321 in words is "forty-two million, one hundred eighty-seven thousand, three hundred twenty-one".