4233440021 has 4 divisors (see below), whose sum is σ = 4234371552. Its totient is φ = 4232508492.

The previous prime is 4233440009. The next prime is 4233440047. The reversal of 4233440021 is 1200443324.

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 4233440021 - 2¹⁸ = 4233177877 is a prime.

It is a super-2 number, since 2×4233440021² = 35844028822808960882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4233440051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458915 + ... + 468048.

It is an arithmetic number, because the mean of its divisors is an integer number (1058592888).

Almost surely, 2^4233440021 is an apocalyptic number.

It is an amenable number.

4233440021 is a deficient number, since it is larger than the sum of its proper divisors (931531).

4233440021 is an equidigital number, since it uses as much as digits as its factorization.

4233440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931530.

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

The square root of 4233440021 is about 65064.8908475224. The cubic root of 4233440021 is about 1617.6993228468.

Adding to 4233440021 its reverse (1200443324), we get a palindrome (5433883345).

The spelling of 4233440021 in words is "four billion, two hundred thirty-three million, four hundred forty thousand, twenty-one".