4543023421 has 4 divisors (see below), whose sum is σ = 4589858812. Its totient is φ = 4496188032.

The previous prime is 4543023389. The next prime is 4543023439. The reversal of 4543023421 is 1243203454.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1243203454 = 2 ⋅621601727.

It can be written as a sum of positive squares in 2 ways, for example, as 1703625625 + 2839397796 = 41275^2 + 53286^2 .

It is a cyclic number.

It is not a de Polignac number, because 4543023421 - 2⁵ = 4543023389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4543023421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4543023451) 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, 23417550 + ... + 23417743.

It is an arithmetic number, because the mean of its divisors is an integer number (1147464703).

Almost surely, 2^4543023421 is an apocalyptic number.

It is an amenable number.

4543023421 is a deficient number, since it is larger than the sum of its proper divisors (46835391).

4543023421 is an equidigital number, since it uses as much as digits as its factorization.

4543023421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46835390.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 4543023421 is about 67401.9541333929. The cubic root of 4543023421 is about 1656.2084341181.

Adding to 4543023421 its reverse (1243203454), we get a palindrome (5786226875).

The spelling of 4543023421 in words is "four billion, five hundred forty-three million, twenty-three thousand, four hundred twenty-one".