13345521 has 16 divisors (see below), whose sum is σ = 20428800. Its totient is φ = 7591248.

The previous prime is 13345513. The next prime is 13345571. The reversal of 13345521 is 12554331.

It is not a de Polignac number, because 13345521 - 2³ = 13345513 is a prime.

It is a super-2 number, since 2×13345521² = 356205861522882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13345491 and 13345500.

It is not an unprimeable number, because it can be changed into a prime (13345511) 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, 3690 + ... + 6348.

It is an arithmetic number, because the mean of its divisors is an integer number (1276800).

Almost surely, 2^13345521 is an apocalyptic number.

It is an amenable number.

13345521 is a deficient number, since it is larger than the sum of its proper divisors (7083279).

13345521 is a wasteful number, since it uses less digits than its factorization.

13345521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908.

The product of its digits is 1800, while the sum is 24.

The square root of 13345521 is about 3653.1522004975. The cubic root of 13345521 is about 237.1984486797.

Adding to 13345521 its reverse (12554331), we get a palindrome (25899852).

It can be divided in two parts, 133 and 45521, that added together give a palindrome (45654).

The spelling of 13345521 in words is "thirteen million, three hundred forty-five thousand, five hundred twenty-one".