224212221 has 6 divisors (see below), whose sum is σ = 323862110. Its totient is φ = 149474808.

The previous prime is 224212189. The next prime is 224212259. The reversal of 224212221 is 122212422.

224212221 is a `hidden beast` number, since 22 + 421 + 2 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 187306596 + 36905625 = 13686^2 + 6075^2 .

It is not a de Polignac number, because 224212221 - 2⁵ = 224212189 is a prime.

It is a super-2 number, since 2×224212221² = 100542240091505682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 224212194 and 224212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224212291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12456226 + ... + 12456243.

Almost surely, 2^224212221 is an apocalyptic number.

It is an amenable number.

224212221 is a deficient number, since it is larger than the sum of its proper divisors (99649889).

224212221 is a wasteful number, since it uses less digits than its factorization.

224212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24912475 (or 24912472 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 224212221 is about 14973.7176746458. The cubic root of 224212221 is about 607.5095278697.

Adding to 224212221 its reverse (122212422), we get a palindrome (346424643).

It can be divided in two parts, 22421 and 2221, that added together give a palindrome (24642).

The spelling of 224212221 in words is "two hundred twenty-four million, two hundred twelve thousand, two hundred twenty-one".