42480821 has 4 divisors (see below), whose sum is σ = 42493932. Its totient is φ = 42467712.

The previous prime is 42480803. The next prime is 42480833. The reversal of 42480821 is 12808424.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36300625 + 6180196 = 6025^2 + 2486^2 .

It is a cyclic number.

It is not a de Polignac number, because 42480821 - 2¹⁸ = 42218677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42480121) 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 3 ways as a sum of consecutive naturals, for example, 2231 + ... + 9483.

It is an arithmetic number, because the mean of its divisors is an integer number (10623483).

Almost surely, 2^42480821 is an apocalyptic number.

It is an amenable number.

42480821 is a deficient number, since it is larger than the sum of its proper divisors (13111).

42480821 is an equidigital number, since it uses as much as digits as its factorization.

42480821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13110.

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 42480821 is about 6517.7312770626. The cubic root of 42480821 is about 348.9241001549.

The spelling of 42480821 in words is "forty-two million, four hundred eighty thousand, eight hundred twenty-one".