42821041 has 4 divisors (see below), whose sum is σ = 45074800. Its totient is φ = 40567284.

The previous prime is 42821029. The next prime is 42821057. The reversal of 42821041 is 14012824.

42821041 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42821041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42821021) 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, 1126851 + ... + 1126888.

It is an arithmetic number, because the mean of its divisors is an integer number (11268700).

Almost surely, 2^42821041 is an apocalyptic number.

It is an amenable number.

42821041 is a deficient number, since it is larger than the sum of its proper divisors (2253759).

42821041 is a wasteful number, since it uses less digits than its factorization.

42821041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253758.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 42821041 is about 6543.7788012738. The cubic root of 42821041 is about 349.8531111511.

Adding to 42821041 its reverse (14012824), we get a palindrome (56833865).

The spelling of 42821041 in words is "forty-two million, eight hundred twenty-one thousand, forty-one".