43420304021 has 4 divisors (see below), whose sum is σ = 45705583200. Its totient is φ = 41135024844.

The previous prime is 43420303963. The next prime is 43420304023. The reversal of 43420304021 is 12040302434.

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 a de Polignac number, because none of the positive numbers 2^k-43420304021 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 (43420304023) 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, 1142639561 + ... + 1142639598.

It is an arithmetic number, because the mean of its divisors is an integer number (11426395800).

Almost surely, 2^43420304021 is an apocalyptic number.

It is an amenable number.

43420304021 is a deficient number, since it is larger than the sum of its proper divisors (2285279179).

43420304021 is a wasteful number, since it uses less digits than its factorization.

43420304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285279178.

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

Adding to 43420304021 its reverse (12040302434), we get a palindrome (55460606455).

The spelling of 43420304021 in words is "forty-three billion, four hundred twenty million, three hundred four thousand, twenty-one".