224220421 has 4 divisors (see below), whose sum is σ = 225093132. Its totient is φ = 223347712.

The previous prime is 224220419. The next prime is 224220443. The reversal of 224220421 is 124022422.

224220421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124022422 = 2 ⋅62011211.

It can be written as a sum of positive squares in 2 ways, for example, as 199120321 + 25100100 = 14111^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 224220421 - 2¹ = 224220419 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 (224220461) 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, 435970 + ... + 436483.

It is an arithmetic number, because the mean of its divisors is an integer number (56273283).

Almost surely, 2^224220421 is an apocalyptic number.

It is an amenable number.

224220421 is a deficient number, since it is larger than the sum of its proper divisors (872711).

224220421 is an equidigital number, since it uses as much as digits as its factorization.

224220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872710.

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

The square root of 224220421 is about 14973.9914852387. The cubic root of 224220421 is about 607.5169338255.

Adding to 224220421 its reverse (124022422), we get a palindrome (348242843).

The spelling of 224220421 in words is "two hundred twenty-four million, two hundred twenty thousand, four hundred twenty-one".