4243955421 has 8 divisors (see below), whose sum is σ = 5659357984. Its totient is φ = 2828928240.

The previous prime is 4243955407. The next prime is 4243955431. The reversal of 4243955421 is 1245593424.

4243955421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4243955421 - 2⁹ = 4243954909 is a prime.

It is a super-2 number, since 2×4243955421² = 36022315230870574482, which contains 22 as substring.

It is a Duffinian number.

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 4243955421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243955431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66310 + ... + 113511.

It is an arithmetic number, because the mean of its divisors is an integer number (707419748).

Almost surely, 2^4243955421 is an apocalyptic number.

It is an amenable number.

4243955421 is a deficient number, since it is larger than the sum of its proper divisors (1415402563).

4243955421 is a wasteful number, since it uses less digits than its factorization.

4243955421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187691.

The product of its digits is 172800, while the sum is 39.

The square root of 4243955421 is about 65145.6477517877. The cubic root of 4243955421 is about 1619.0376112124.

The spelling of 4243955421 in words is "four billion, two hundred forty-three million, nine hundred fifty-five thousand, four hundred twenty-one".