4243230021 has 16 divisors (see below), whose sum is σ = 5705981568. Its totient is φ = 2804736000.

The previous prime is 4243230001. The next prime is 4243230023. The reversal of 4243230021 is 1200323424.

It is not a de Polignac number, because 4243230021 - 2¹⁵ = 4243197253 is a prime.

It is a super-2 number, since 2×4243230021² = 36010002022231320882, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4243230021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243230023) 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, 190341 + ... + 211461.

It is an arithmetic number, because the mean of its divisors is an integer number (356623848).

Almost surely, 2^4243230021 is an apocalyptic number.

It is an amenable number.

4243230021 is a deficient number, since it is larger than the sum of its proper divisors (1462751547).

4243230021 is a wasteful number, since it uses less digits than its factorization.

4243230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21692.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 4243230021 is about 65140.0799892048. The cubic root of 4243230021 is about 1618.9453610442.

Adding to 4243230021 its reverse (1200323424), we get a palindrome (5443553445).

The spelling of 4243230021 in words is "four billion, two hundred forty-three million, two hundred thirty thousand, twenty-one".