43554421 has 4 divisors (see below), whose sum is σ = 43618144. Its totient is φ = 43490700.

The previous prime is 43554419. The next prime is 43554437. The reversal of 43554421 is 12445534.

43554421 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 an emirpimes, since its reverse is a distinct semiprime: 12445534 = 2 ⋅6222767.

It is a cyclic number.

It is not a de Polignac number, because 43554421 - 2¹ = 43554419 is a prime.

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 43554421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43554461) 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, 30825 + ... + 32206.

It is an arithmetic number, because the mean of its divisors is an integer number (10904536).

Almost surely, 2^43554421 is an apocalyptic number.

It is an amenable number.

43554421 is a deficient number, since it is larger than the sum of its proper divisors (63723).

43554421 is an equidigital number, since it uses as much as digits as its factorization.

43554421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63722.

The product of its digits is 9600, while the sum is 28.

The square root of 43554421 is about 6599.5773349511. The cubic root of 43554421 is about 351.8390841840.

Adding to 43554421 its reverse (12445534), we get a palindrome (55999955).

The spelling of 43554421 in words is "forty-three million, five hundred fifty-four thousand, four hundred twenty-one".