43420443021 has 24 divisors (see below), whose sum is σ = 62913853184. Its totient is φ = 28856852640.

The previous prime is 43420442983. The next prime is 43420443029. The reversal of 43420443021 is 12034402434.

It is a happy number.

43420443021 is a `hidden beast` number, since 4 + 3 + 4 + 204 + 430 + 21 = 666.

It is not a de Polignac number, because 43420443021 - 2⁶ = 43420442957 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 (43420443029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9455436 + ... + 9460026.

Almost surely, 2^43420443021 is an apocalyptic number.

It is an amenable number.

43420443021 is a deficient number, since it is larger than the sum of its proper divisors (19493410163).

43420443021 is a wasteful number, since it uses less digits than its factorization.

43420443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7641 (or 7638 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 43420443021 its reverse (12034402434), we get a palindrome (55454845455).

The spelling of 43420443021 in words is "forty-three billion, four hundred twenty million, four hundred forty-three thousand, twenty-one".