13145421 has 4 divisors (see below), whose sum is σ = 17527232. Its totient is φ = 8763612.

The previous prime is 13145417. The next prime is 13145449. The reversal of 13145421 is 12454131.

13145421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12454131 = 3 ⋅4151377.

It is not a de Polignac number, because 13145421 - 2² = 13145417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13145411) 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 3 ways as a sum of consecutive naturals, for example, 2190901 + ... + 2190906.

It is an arithmetic number, because the mean of its divisors is an integer number (4381808).

Almost surely, 2^13145421 is an apocalyptic number.

It is an amenable number.

13145421 is a deficient number, since it is larger than the sum of its proper divisors (4381811).

13145421 is an equidigital number, since it uses as much as digits as its factorization.

13145421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4381810.

The product of its digits is 480, while the sum is 21.

The square root of 13145421 is about 3625.6614568931. The cubic root of 13145421 is about 236.0069721679.

Adding to 13145421 its reverse (12454131), we get a palindrome (25599552).

The spelling of 13145421 in words is "thirteen million, one hundred forty-five thousand, four hundred twenty-one".