42041521 has 4 divisors (see below), whose sum is σ = 42230272. Its totient is φ = 41852772.

The previous prime is 42041513. The next prime is 42041533. The reversal of 42041521 is 12514024.

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 42041521 - 2³ = 42041513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42041581) 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, 94041 + ... + 94486.

It is an arithmetic number, because the mean of its divisors is an integer number (10557568).

Almost surely, 2^42041521 is an apocalyptic number.

It is an amenable number.

42041521 is a deficient number, since it is larger than the sum of its proper divisors (188751).

42041521 is a wasteful number, since it uses less digits than its factorization.

42041521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188750.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 42041521 is about 6483.9433217757. The cubic root of 42041521 is about 347.7171728757.

Adding to 42041521 its reverse (12514024), we get a palindrome (54555545).

The spelling of 42041521 in words is "forty-two million, forty-one thousand, five hundred twenty-one".