42816321 has 12 divisors (see below), whose sum is σ = 61902672. Its totient is φ = 28517976.

The previous prime is 42816311. The next prime is 42816343. The reversal of 42816321 is 12361824.

42816321 is a `hidden beast` number, since 4 + 28 + 1 + 632 + 1 = 666.

It is not a de Polignac number, because 42816321 - 2¹⁴ = 42799937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42816311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17070 + ... + 19416.

It is an arithmetic number, because the mean of its divisors is an integer number (5158556).

Almost surely, 2^42816321 is an apocalyptic number.

It is an amenable number.

42816321 is a deficient number, since it is larger than the sum of its proper divisors (19086351).

42816321 is a wasteful number, since it uses less digits than its factorization.

42816321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380 (or 4377 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 42816321 is about 6543.4181434477. The cubic root of 42816321 is about 349.8402563541.

The spelling of 42816321 in words is "forty-two million, eight hundred sixteen thousand, three hundred twenty-one".