221222444 has 12 divisors (see below), whose sum is σ = 396142824. Its totient is φ = 108038784.

The previous prime is 221222437. The next prime is 221222461. The reversal of 221222444 is 444222122.

221222444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642917 + ... + 643260.

It is an arithmetic number, because the mean of its divisors is an integer number (33011902).

Almost surely, 2^221222444 is an apocalyptic number.

It is an amenable number.

221222444 is a deficient number, since it is larger than the sum of its proper divisors (174920380).

221222444 is a wasteful number, since it uses less digits than its factorization.

221222444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286224 (or 1286222 counting only the distinct ones).

The product of its digits is 2048, while the sum is 23.

The square root of 221222444 is about 14873.5484669933. The cubic root of 221222444 is about 604.7971398284.

Adding to 221222444 its reverse (444222122), we get a palindrome (665444566).

The spelling of 221222444 in words is "two hundred twenty-one million, two hundred twenty-two thousand, four hundred forty-four".