224224021 has 16 divisors (see below), whose sum is σ = 258926976. Its totient is φ = 190201536.

The previous prime is 224223943. The next prime is 224224051. The reversal of 224224021 is 120422422.

It is not a de Polignac number, because 224224021 - 2¹¹ = 224221973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 224224021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224224051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381690 + ... + 382276.

It is an arithmetic number, because the mean of its divisors is an integer number (16182936).

Almost surely, 2^224224021 is an apocalyptic number.

It is an amenable number.

224224021 is a deficient number, since it is larger than the sum of its proper divisors (34702955).

224224021 is a wasteful number, since it uses less digits than its factorization.

224224021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068.

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

The square root of 224224021 is about 14974.1116931857. Note that the first 3 decimals coincide. The cubic root of 224224021 is about 607.5201851637.

Adding to 224224021 its reverse (120422422), we get a palindrome (344646443).

The spelling of 224224021 in words is "two hundred twenty-four million, two hundred twenty-four thousand, twenty-one".