4421021 has 8 divisors (see below), whose sum is σ = 4989600. Its totient is φ = 3880240.

The previous prime is 4420993. The next prime is 4421023. The reversal of 4421021 is 1201244.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4421021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4420987 and 4421005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4421023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6611 + ... + 7248.

It is an arithmetic number, because the mean of its divisors is an integer number (623700).

Almost surely, 2^4421021 is an apocalyptic number.

It is an amenable number.

4421021 is a deficient number, since it is larger than the sum of its proper divisors (568579).

4421021 is a wasteful number, since it uses less digits than its factorization.

4421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13899.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 4421021 is about 2102.6224102297. The cubic root of 4421021 is about 164.1247934753.

Adding to 4421021 its reverse (1201244), we get a palindrome (5622265).

The spelling of 4421021 in words is "four million, four hundred twenty-one thousand, twenty-one".