42333521 has 4 divisors (see below), whose sum is σ = 42348852. Its totient is φ = 42318192.

The previous prime is 42333509. The next prime is 42333581. The reversal of 42333521 is 12533324.

42333521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83521 + 42250000 = 289^2 + 6500^2 .

It is a cyclic number.

It is not a de Polignac number, because 42333521 - 2²² = 38139217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42333581) 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 3 ways as a sum of consecutive naturals, for example, 2246 + ... + 9471.

It is an arithmetic number, because the mean of its divisors is an integer number (10587213).

Almost surely, 2^42333521 is an apocalyptic number.

It is an amenable number.

42333521 is a deficient number, since it is larger than the sum of its proper divisors (15331).

42333521 is a wasteful number, since it uses less digits than its factorization.

42333521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15330.

The product of its digits is 2160, while the sum is 23.

The square root of 42333521 is about 6506.4215203136. The cubic root of 42333521 is about 348.5203411695.

Adding to 42333521 its reverse (12533324), we get a palindrome (54866845).

The spelling of 42333521 in words is "forty-two million, three hundred thirty-three thousand, five hundred twenty-one".