4223421 has 20 divisors (see below), whose sum is σ = 6586272. Its totient is φ = 2692008.

The previous prime is 4223413. The next prime is 4223431. The reversal of 4223421 is 1243224.

It is not a de Polignac number, because 4223421 - 2³ = 4223413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4223394 and 4223403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4223431) 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 19 ways as a sum of consecutive naturals, for example, 730 + ... + 2996.

Almost surely, 2^4223421 is an apocalyptic number.

It is an amenable number.

4223421 is a deficient number, since it is larger than the sum of its proper divisors (2362851).

4223421 is a wasteful number, since it uses less digits than its factorization.

4223421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302 (or 2293 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 4223421 is about 2055.0963481063. The cubic root of 4223421 is about 161.6422145089.

Adding to 4223421 its reverse (1243224), we get a palindrome (5466645).

The spelling of 4223421 in words is "four million, two hundred twenty-three thousand, four hundred twenty-one".