821421041 has 8 divisors (see below), whose sum is σ = 939065280. Its totient is φ = 703851408.

The previous prime is 821421031. The next prime is 821421061. The reversal of 821421041 is 140124128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821421041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 821420998 and 821421016.

It is not an unprimeable number, because it can be changed into a prime (821421031) 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, 7370 + ... + 41196.

It is an arithmetic number, because the mean of its divisors is an integer number (117383160).

Almost surely, 2^821421041 is an apocalyptic number.

It is an amenable number.

821421041 is a deficient number, since it is larger than the sum of its proper divisors (117644239).

821421041 is a wasteful number, since it uses less digits than its factorization.

821421041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37303.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 821421041 is about 28660.4438381544. The cubic root of 821421041 is about 936.5305333720.

Adding to 821421041 its reverse (140124128), we get a palindrome (961545169).

The spelling of 821421041 in words is "eight hundred twenty-one million, four hundred twenty-one thousand, forty-one".