224120221 has 8 divisors (see below), whose sum is σ = 241890264. Its totient is φ = 206425920.

The previous prime is 224120213. The next prime is 224120251. The reversal of 224120221 is 122021422.

It can be written as a sum of positive squares in 4 ways, for example, as 19321 + 224100900 = 139^2 + 14970^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 224120221 - 2³ = 224120213 is a prime.

It is a super-2 number, since 2×224120221² = 100459746922177682, 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 = 224120195 and 224120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224120251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12706 + ... + 24691.

It is an arithmetic number, because the mean of its divisors is an integer number (30236283).

Almost surely, 2^224120221 is an apocalyptic number.

It is an amenable number.

224120221 is a deficient number, since it is larger than the sum of its proper divisors (17770043).

224120221 is a wasteful number, since it uses less digits than its factorization.

224120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37871.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 224120221 is about 14970.6453100726. The cubic root of 224120221 is about 607.4264242777.

Adding to 224120221 its reverse (122021422), we get a palindrome (346141643).

The spelling of 224120221 in words is "two hundred twenty-four million, one hundred twenty thousand, two hundred twenty-one".