224404021 has 4 divisors (see below), whose sum is σ = 224464032. Its totient is φ = 224344012.

The previous prime is 224404013. The next prime is 224404027. The reversal of 224404021 is 120404422.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120404422 = 2 ⋅60202211.

It is a cyclic number.

It is not a de Polignac number, because 224404021 - 2³ = 224404013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 224404021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224404027) 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 3 ways as a sum of consecutive naturals, for example, 23995 + ... + 32008.

It is an arithmetic number, because the mean of its divisors is an integer number (56116008).

Almost surely, 2^224404021 is an apocalyptic number.

It is an amenable number.

224404021 is a deficient number, since it is larger than the sum of its proper divisors (60011).

224404021 is an equidigital number, since it uses as much as digits as its factorization.

224404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60010.

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

The square root of 224404021 is about 14980.1208606606. The cubic root of 224404021 is about 607.6827077218.

Adding to 224404021 its reverse (120404422), we get a palindrome (344808443).

The spelling of 224404021 in words is "two hundred twenty-four million, four hundred four thousand, twenty-one".