1224444221 has 32 divisors (see below), whose sum is σ = 1682300928. Its totient is φ = 860207040.

The previous prime is 1224444191. The next prime is 1224444223.

It is a happy number.

1224444221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1224444221 - 2¹⁰ = 1224443197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224444223) 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 31 ways as a sum of consecutive naturals, for example, 28820 + ... + 57266.

It is an arithmetic number, because the mean of its divisors is an integer number (52571904).

Almost surely, 2^1224444221 is an apocalyptic number.

1224444221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1224444221 is a deficient number, since it is larger than the sum of its proper divisors (457856707).

1224444221 is a wasteful number, since it uses less digits than its factorization.

1224444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28521.

The product of its digits is 4096, while the sum is 26.

The square root of 1224444221 is about 34992.0593992409. The cubic root of 1224444221 is about 1069.8256393327.

It can be divided in two parts, 12244 and 44221, that added together give a palindrome (56465).

The spelling of 1224444221 in words is "one billion, two hundred twenty-four million, four hundred forty-four thousand, two hundred twenty-one".