224444021 has 4 divisors (see below), whose sum is σ = 232183500. Its totient is φ = 216704544.

The previous prime is 224443997. The next prime is 224444039. The reversal of 224444021 is 120444422.

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 159012100 + 65431921 = 12610^2 + 8089^2 .

It is a cyclic number.

It is not a de Polignac number, because 224444021 - 2⁶ = 224443957 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 (224444221) 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, 3869696 + ... + 3869753.

It is an arithmetic number, because the mean of its divisors is an integer number (58045875).

Almost surely, 2^224444021 is an apocalyptic number.

It is an amenable number.

224444021 is a deficient number, since it is larger than the sum of its proper divisors (7739479).

224444021 is an equidigital number, since it uses as much as digits as its factorization.

224444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7739478.

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 224444021 is about 14981.4559038833. The cubic root of 224444021 is about 607.7188120425.

Adding to 224444021 its reverse (120444422), we get a palindrome (344888443).

The spelling of 224444021 in words is "two hundred twenty-four million, four hundred forty-four thousand, twenty-one".