13430521 has 8 divisors (see below), whose sum is σ = 14571144. Its totient is φ = 12305280.

The previous prime is 13430507. The next prime is 13430539. The reversal of 13430521 is 12503431.

13430521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5625 + 13424896 = 75^2 + 3664^2 .

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

It is not a de Polignac number, because 13430521 - 2⁹ = 13430009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13430581) 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, 1990 + ... + 5551.

It is an arithmetic number, because the mean of its divisors is an integer number (1821393).

Almost surely, 2^13430521 is an apocalyptic number.

It is an amenable number.

13430521 is a deficient number, since it is larger than the sum of its proper divisors (1140623).

13430521 is a wasteful number, since it uses less digits than its factorization.

13430521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7691.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 13430521 is about 3664.7675233226. The cubic root of 13430521 is about 237.7009696907.

Adding to 13430521 its reverse (12503431), we get a palindrome (25933952).

The spelling of 13430521 in words is "thirteen million, four hundred thirty thousand, five hundred twenty-one".