13045421 has 4 divisors (see below), whose sum is σ = 13363644. Its totient is φ = 12727200.

The previous prime is 13045391. The next prime is 13045427. The reversal of 13045421 is 12454031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2515396 + 10530025 = 1586^2 + 3245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13045421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13045393 and 13045402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13045427) 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, 159050 + ... + 159131.

It is an arithmetic number, because the mean of its divisors is an integer number (3340911).

Almost surely, 2^13045421 is an apocalyptic number.

It is an amenable number.

13045421 is a deficient number, since it is larger than the sum of its proper divisors (318223).

13045421 is an equidigital number, since it uses as much as digits as its factorization.

13045421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318222.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 13045421 is about 3611.8445426125. The cubic root of 13045421 is about 235.4069965416.

Adding to 13045421 its reverse (12454031), we get a palindrome (25499452).

It can be divided in two parts, 13045 and 421, that multiplied together give a palindrome (5491945).

The spelling of 13045421 in words is "thirteen million, forty-five thousand, four hundred twenty-one".