42216530 has 8 divisors (see below), whose sum is σ = 75989772. Its totient is φ = 16886608.

The previous prime is 42216521. The next prime is 42216533. The reversal of 42216530 is 3561224.

It can be written as a sum of positive squares in 2 ways, for example, as 39450961 + 2765569 = 6281^2 + 1663^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 42216496 and 42216505.

It is not an unprimeable number, because it can be changed into a prime (42216533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2110817 + ... + 2110836.

Almost surely, 2^42216530 is an apocalyptic number.

42216530 is a deficient number, since it is larger than the sum of its proper divisors (33773242).

42216530 is a wasteful number, since it uses less digits than its factorization.

42216530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4221660.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 42216530 is about 6497.4248745176. The cubic root of 42216530 is about 348.1989932935.

Adding to 42216530 its reverse (3561224), we get a palindrome (45777754).

The spelling of 42216530 in words is "forty-two million, two hundred sixteen thousand, five hundred thirty".