43004032421 has 4 divisors (see below), whose sum is σ = 49147465632. Its totient is φ = 36860599212.

The previous prime is 43004032417. The next prime is 43004032441. The reversal of 43004032421 is 12423040034.

43004032421 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.

It is a cyclic number.

It is not a de Polignac number, because 43004032421 - 2² = 43004032417 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 (43004032441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3071716595 + ... + 3071716608.

It is an arithmetic number, because the mean of its divisors is an integer number (12286866408).

Almost surely, 2^43004032421 is an apocalyptic number.

It is an amenable number.

43004032421 is a deficient number, since it is larger than the sum of its proper divisors (6143433211).

43004032421 is an equidigital number, since it uses as much as digits as its factorization.

43004032421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6143433210.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 43004032421 its reverse (12423040034), we get a palindrome (55427072455).

The spelling of 43004032421 in words is "forty-three billion, four million, thirty-two thousand, four hundred twenty-one".