4224421 has 4 divisors (see below), whose sum is σ = 4231372. Its totient is φ = 4217472.

The previous prime is 4224397. The next prime is 4224427. The reversal of 4224421 is 1244224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3045025 + 1179396 = 1745^2 + 1086^2 .

It is a cyclic number.

It is not a de Polignac number, because 4224421 - 2¹¹ = 4222373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4224427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2466 + ... + 3811.

It is an arithmetic number, because the mean of its divisors is an integer number (1057843).

Almost surely, 2^4224421 is an apocalyptic number.

It is an amenable number.

4224421 is a deficient number, since it is larger than the sum of its proper divisors (6951).

4224421 is an equidigital number, since it uses as much as digits as its factorization.

4224421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6950.

The product of its digits is 512, while the sum is 19.

The square root of 4224421 is about 2055.3396313018. The cubic root of 4224421 is about 161.6549711075.

Adding to 4224421 its reverse (1244224), we get a palindrome (5468645).

The spelling of 4224421 in words is "four million, two hundred twenty-four thousand, four hundred twenty-one".