224400021 has 8 divisors (see below), whose sum is σ = 299270400. Its totient is φ = 149564832.

The previous prime is 224399993. The next prime is 224400047. The reversal of 224400021 is 120004422.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 224400021 - 2¹⁷ = 224268949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224600021) 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 7 ways as a sum of consecutive naturals, for example, 16380 + ... + 26778.

It is an arithmetic number, because the mean of its divisors is an integer number (37408800).

Almost surely, 2^224400021 is an apocalyptic number.

It is an amenable number.

224400021 is a deficient number, since it is larger than the sum of its proper divisors (74870379).

224400021 is a wasteful number, since it uses less digits than its factorization.

224400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17595.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 224400021 is about 14979.9873497944. The cubic root of 224400021 is about 607.6790970538.

Adding to 224400021 its reverse (120004422), we get a palindrome (344404443).

It can be divided in two parts, 2244000 and 21, that added together give a triangular number (2244021 = T₂₁₁₈).

The spelling of 224400021 in words is "two hundred twenty-four million, four hundred thousand, twenty-one".