4243421 has 24 divisors (see below), whose sum is σ = 5586624. Its totient is φ = 3144960.

The previous prime is 4243411. The next prime is 4243427. The reversal of 4243421 is 1243424.

It is not a de Polignac number, because 4243421 - 2⁶ = 4243357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4243393 and 4243402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20006 + ... + 20216.

It is an arithmetic number, because the mean of its divisors is an integer number (232776).

Almost surely, 2^4243421 is an apocalyptic number.

It is an amenable number.

4243421 is a deficient number, since it is larger than the sum of its proper divisors (1343203).

4243421 is a wasteful number, since it uses less digits than its factorization.

4243421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 248 counting only the distinct ones).

The product of its digits is 768, while the sum is 20.

The square root of 4243421 is about 2059.9565529399. The cubic root of 4243421 is about 161.8969649140.

Adding to 4243421 its reverse (1243424), we get a palindrome (5486845).

It can be divided in two parts, 4243 and 421, that added together give a palindrome (4664).

The spelling of 4243421 in words is "four million, two hundred forty-three thousand, four hundred twenty-one".