13503421 has 2 divisors, whose sum is σ = 13503422. Its totient is φ = 13503420.

The previous prime is 13503407. The next prime is 13503437. The reversal of 13503421 is 12430531.

13503421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9523396 + 3980025 = 3086^2 + 1995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13503421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13503401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6751710 + 6751711.

It is an arithmetic number, because the mean of its divisors is an integer number (6751711).

Almost surely, 2^13503421 is an apocalyptic number.

It is an amenable number.

13503421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13503421 is an equidigital number, since it uses as much as digits as its factorization.

13503421 is an evil number, because the sum of its binary digits is even.

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

The square root of 13503421 is about 3674.7001238196. The cubic root of 13503421 is about 238.1302690558.

Adding to 13503421 its reverse (12430531), we get a palindrome (25933952).

It can be divided in two parts, 13503 and 421, that added together give a square (13924 = 118²).

The spelling of 13503421 in words is "thirteen million, five hundred three thousand, four hundred twenty-one".