4223021 has 12 divisors (see below), whose sum is σ = 4917276. Its totient is φ = 3611520.

The previous prime is 4223003. The next prime is 4223027. The reversal of 4223021 is 1203224.

It can be written as a sum of positive squares in 2 ways, for example, as 2758921 + 1464100 = 1661^2 + 1210^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4223021 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4222987 and 4223005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4223027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1031 + ... + 3083.

It is an arithmetic number, because the mean of its divisors is an integer number (409773).

Almost surely, 2^4223021 is an apocalyptic number.

It is an amenable number.

4223021 is a deficient number, since it is larger than the sum of its proper divisors (694255).

4223021 is a wasteful number, since it uses less digits than its factorization.

4223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092 (or 2081 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 4223021 is about 2054.9990267638. Note that the first 3 decimals coincide. The cubic root of 4223021 is about 161.6371113057.

Adding to 4223021 its reverse (1203224), we get a palindrome (5426245).

It can be divided in two parts, 422 and 3021, that added together give a palindrome (3443).

The spelling of 4223021 in words is "four million, two hundred twenty-three thousand, twenty-one".