13603021 has 4 divisors (see below), whose sum is σ = 13934844. Its totient is φ = 13271200.

The previous prime is 13603019. The next prime is 13603049. The reversal of 13603021 is 12030631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12030631 = 59 ⋅203909.

It can be written as a sum of positive squares in 2 ways, for example, as 7502121 + 6100900 = 2739^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 13603021 - 2¹ = 13603019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13602986 and 13603004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13603921) 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 3 ways as a sum of consecutive naturals, for example, 165850 + ... + 165931.

It is an arithmetic number, because the mean of its divisors is an integer number (3483711).

Almost surely, 2^13603021 is an apocalyptic number.

It is an amenable number.

13603021 is a deficient number, since it is larger than the sum of its proper divisors (331823).

13603021 is an equidigital number, since it uses as much as digits as its factorization.

13603021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331822.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 13603021 is about 3688.2273519945. The cubic root of 13603021 is about 238.7143111589.

Adding to 13603021 its reverse (12030631), we get a palindrome (25633652).

The spelling of 13603021 in words is "thirteen million, six hundred three thousand, twenty-one".