224221555 has 4 divisors (see below), whose sum is σ = 269065872. Its totient is φ = 179377240.

The previous prime is 224221553. The next prime is 224221559. The reversal of 224221555 is 555122422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555122422 = 2 ⋅277561211.

It is not a de Polignac number, because 224221555 - 2¹ = 224221553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224221553) 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 3 ways as a sum of consecutive naturals, for example, 22422151 + ... + 22422160.

It is an arithmetic number, because the mean of its divisors is an integer number (67266468).

Almost surely, 2^224221555 is an apocalyptic number.

224221555 is a deficient number, since it is larger than the sum of its proper divisors (44844317).

224221555 is an equidigital number, since it uses as much as digits as its factorization.

224221555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44844316.

The product of its digits is 8000, while the sum is 28.

The square root of 224221555 is about 14974.0293508461. The cubic root of 224221555 is about 607.5179580008.

Adding to 224221555 its reverse (555122422), we get a palindrome (779343977).

The spelling of 224221555 in words is "two hundred twenty-four million, two hundred twenty-one thousand, five hundred fifty-five".