42533521 has 4 divisors (see below), whose sum is σ = 43072000. Its totient is φ = 41995044.

The previous prime is 42533501. The next prime is 42533527. The reversal of 42533521 is 12533524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42533521 - 2⁵ = 42533489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42533527) 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, 269121 + ... + 269278.

It is an arithmetic number, because the mean of its divisors is an integer number (10768000).

Almost surely, 2^42533521 is an apocalyptic number.

It is an amenable number.

42533521 is a deficient number, since it is larger than the sum of its proper divisors (538479).

42533521 is an equidigital number, since it uses as much as digits as its factorization.

42533521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538478.

The product of its digits is 3600, while the sum is 25.

The square root of 42533521 is about 6521.7728417969. The cubic root of 42533521 is about 349.0683276043.

The spelling of 42533521 in words is "forty-two million, five hundred thirty-three thousand, five hundred twenty-one".