42243521 has 8 divisors (see below), whose sum is σ = 44956800. Its totient is φ = 39555648.

The previous prime is 42243511. The next prime is 42243527. The reversal of 42243521 is 12534224.

It is a happy number.

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 42243521 - 2¹⁴ = 42227137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42243527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2861 + ... + 9626.

It is an arithmetic number, because the mean of its divisors is an integer number (5619600).

Almost surely, 2^42243521 is an apocalyptic number.

It is an amenable number.

42243521 is a deficient number, since it is larger than the sum of its proper divisors (2713279).

42243521 is a wasteful number, since it uses less digits than its factorization.

42243521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12703.

The product of its digits is 1920, while the sum is 23.

The square root of 42243521 is about 6499.5015962764. The cubic root of 42243521 is about 348.2731841127.

Adding to 42243521 its reverse (12534224), we get a palindrome (54777745).

The spelling of 42243521 in words is "forty-two million, two hundred forty-three thousand, five hundred twenty-one".