224636221 has 18 divisors (see below), whose sum is σ = 243377466. Its totient is φ = 207252000.

The previous prime is 224636201. The next prime is 224636227. The reversal of 224636221 is 122636422.

It can be written as a sum of positive squares in 3 ways, for example, as 88096996 + 136539225 = 9386^2 + 11685^2 .

It is a de Polignac number, because none of the positive numbers 2^k-224636221 is a prime.

It is a super-2 number, since 2×224636221² = 100922863570321682, which contains 22 as substring.

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 224636221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224636227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2224071 + ... + 2224171.

Almost surely, 2^224636221 is an apocalyptic number.

It is an amenable number.

224636221 is a deficient number, since it is larger than the sum of its proper divisors (18741245).

224636221 is an equidigital number, since it uses as much as digits as its factorization.

224636221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 181 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 224636221 is about 14987.8691280649. The cubic root of 224636221 is about 607.8922335040.

The spelling of 224636221 in words is "two hundred twenty-four million, six hundred thirty-six thousand, two hundred twenty-one".