13030821 has 16 divisors (see below), whose sum is σ = 19480320. Its totient is φ = 8608320.

The previous prime is 13030793. The next prime is 13030877. The reversal of 13030821 is 12803031.

It is not a de Polignac number, because 13030821 - 2¹⁵ = 12998053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13030794 and 13030803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13030621) 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 15 ways as a sum of consecutive naturals, for example, 916 + ... + 5186.

It is an arithmetic number, because the mean of its divisors is an integer number (1217520).

Almost surely, 2^13030821 is an apocalyptic number.

It is an amenable number.

13030821 is a deficient number, since it is larger than the sum of its proper divisors (6449499).

13030821 is a wasteful number, since it uses less digits than its factorization.

13030821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4393 (or 4387 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 13030821 is about 3609.8228488390. The cubic root of 13030821 is about 235.3191438736.

Adding to 13030821 its reverse (12803031), we get a palindrome (25833852).

The spelling of 13030821 in words is "thirteen million, thirty thousand, eight hundred twenty-one".