43003421 has 4 divisors (see below), whose sum is σ = 45533052. Its totient is φ = 40473792.

The previous prime is 43003409. The next prime is 43003423. The reversal of 43003421 is 12430034.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12430034 = 2 ⋅6215017.

It can be written as a sum of positive squares in 2 ways, for example, as 11978521 + 31024900 = 3461^2 + 5570^2 .

It is a cyclic number.

It is not a de Polignac number, because 43003421 - 2¹⁴ = 42987037 is a prime.

It is a super-3 number, since 3×43003421³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 2529613 = 43003421 / (4 + 3 + 0 + 0 + 3 + 4 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43003421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43003423) 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, 1264790 + ... + 1264823.

It is an arithmetic number, because the mean of its divisors is an integer number (11383263).

Almost surely, 2^43003421 is an apocalyptic number.

It is an amenable number.

43003421 is a deficient number, since it is larger than the sum of its proper divisors (2529631).

43003421 is a wasteful number, since it uses less digits than its factorization.

43003421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529630.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 43003421 is about 6557.6993679186. The cubic root of 43003421 is about 350.3490965867.

Adding to 43003421 its reverse (12430034), we get a palindrome (55433455).

The spelling of 43003421 in words is "forty-three million, three thousand, four hundred twenty-one".