13416521 has 12 divisors (see below), whose sum is σ = 14489856. Its totient is φ = 12398760.

The previous prime is 13416517. The next prime is 13416539. The reversal of 13416521 is 12561431.

It is not a de Polignac number, because 13416521 - 2² = 13416517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13416511) 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 11 ways as a sum of consecutive naturals, for example, 21800 + ... + 22406.

It is an arithmetic number, because the mean of its divisors is an integer number (1207488).

Almost surely, 2^13416521 is an apocalyptic number.

It is an amenable number.

13416521 is a deficient number, since it is larger than the sum of its proper divisors (1073335).

13416521 is an equidigital number, since it uses as much as digits as its factorization.

13416521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 661 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 13416521 is about 3662.8569450635. The cubic root of 13416521 is about 237.6183476651.

Adding to 13416521 its reverse (12561431), we get a palindrome (25977952).

The spelling of 13416521 in words is "thirteen million, four hundred sixteen thousand, five hundred twenty-one".