4423021 has 2 divisors, whose sum is σ = 4423022. Its totient is φ = 4423020.

The previous prime is 4423019. The next prime is 4423031. The reversal of 4423021 is 1203244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2758921 + 1664100 = 1661^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 4423021 - 2¹ = 4423019 is a prime.

It is a super-2 number, since 2×4423021² = 39126229532882, which contains 22 as substring.

Together with 4423019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 4422986 and 4423004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4423031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2211510 + 2211511.

It is an arithmetic number, because the mean of its divisors is an integer number (2211511).

Almost surely, 2^4423021 is an apocalyptic number.

It is an amenable number.

4423021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4423021 is an equidigital number, since it uses as much as digits as its factorization.

4423021 is an evil number, because the sum of its binary digits is even.

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

The square root of 4423021 is about 2103.0979530207. The cubic root of 4423021 is about 164.1495388981.

Adding to 4423021 its reverse (1203244), we get a palindrome (5626265).

The spelling of 4423021 in words is "four million, four hundred twenty-three thousand, twenty-one".