43421513 has 4 divisors (see below), whose sum is σ = 43434768. Its totient is φ = 43408260.

The previous prime is 43421489. The next prime is 43421527. The reversal of 43421513 is 31512434.

43421513 is digitally balanced in base 2, 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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31512434 = 2 ⋅15756217.

It is a cyclic number.

It is not a de Polignac number, because 43421513 - 2⁶ = 43421449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43421113) 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, 2258 + ... + 9588.

It is an arithmetic number, because the mean of its divisors is an integer number (10858692).

Almost surely, 2^43421513 is an apocalyptic number.

It is an amenable number.

43421513 is a deficient number, since it is larger than the sum of its proper divisors (13255).

43421513 is an equidigital number, since it uses as much as digits as its factorization.

43421513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13254.

The product of its digits is 1440, while the sum is 23.

The square root of 43421513 is about 6589.5002086653. The cubic root of 43421513 is about 351.4808360100.

Adding to 43421513 its reverse (31512434), we get a palindrome (74933947).

It can be divided in two parts, 43421 and 513, that added together give a palindrome (43934).

The spelling of 43421513 in words is "forty-three million, four hundred twenty-one thousand, five hundred thirteen".