8043430021 has 16 divisors (see below), whose sum is σ = 8875899648. Its totient is φ = 7228072000.

The previous prime is 8043429991. The next prime is 8043430033. The reversal of 8043430021 is 1200343408.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8043430021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8043430051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 719940 + ... + 731026.

It is an arithmetic number, because the mean of its divisors is an integer number (554743728).

Almost surely, 2^8043430021 is an apocalyptic number.

It is an amenable number.

8043430021 is a deficient number, since it is larger than the sum of its proper divisors (832469627).

8043430021 is a wasteful number, since it uses less digits than its factorization.

8043430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11852.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 8043430021 is about 89685.1716896389. The cubic root of 8043430021 is about 2003.6126389076.

Adding to 8043430021 its reverse (1200343408), we get a palindrome (9243773429).

The spelling of 8043430021 in words is "eight billion, forty-three million, four hundred thirty thousand, twenty-one".