42521241 has 16 divisors (see below), whose sum is σ = 65894400. Its totient is φ = 23885328.

The previous prime is 42521231. The next prime is 42521249. The reversal of 42521241 is 14212524.

It is not a de Polignac number, because 42521241 - 2¹⁰ = 42520217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (42521249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15921 + ... + 18398.

It is an arithmetic number, because the mean of its divisors is an integer number (4118400).

Almost surely, 2^42521241 is an apocalyptic number.

It is an amenable number.

42521241 is a deficient number, since it is larger than the sum of its proper divisors (23373159).

42521241 is a wasteful number, since it uses less digits than its factorization.

42521241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34388.

The product of its digits is 640, while the sum is 21.

The square root of 42521241 is about 6520.8313120338. The cubic root of 42521241 is about 349.0347307960.

Adding to 42521241 its reverse (14212524), we get a palindrome (56733765).

The spelling of 42521241 in words is "forty-two million, five hundred twenty-one thousand, two hundred forty-one".