4243021 has 8 divisors (see below), whose sum is σ = 4354560. Its totient is φ = 4132752.

The previous prime is 4243009. The next prime is 4243039. The reversal of 4243021 is 1203424.

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

It is a cyclic number.

It is not a de Polignac number, because 4243021 - 2⁵ = 4242989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4242986 and 4243004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11640 + ... + 11998.

It is an arithmetic number, because the mean of its divisors is an integer number (544320).

Almost surely, 2^4243021 is an apocalyptic number.

It is an amenable number.

4243021 is a deficient number, since it is larger than the sum of its proper divisors (111539).

4243021 is a wasteful number, since it uses less digits than its factorization.

4243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 4243021 is about 2059.8594612254. The cubic root of 4243021 is about 161.8918777590.

Adding to 4243021 its reverse (1203424), we get a palindrome (5446445).

The spelling of 4243021 in words is "four million, two hundred forty-three thousand, twenty-one".