221125444 has 6 divisors (see below), whose sum is σ = 386969534. Its totient is φ = 110562720.

The previous prime is 221125369. The next prime is 221125481. The reversal of 221125444 is 444521122.

It can be written as a sum of positive squares in only one way, i.e., 166926400 + 54199044 = 12920^2 + 7362^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27640677 + ... + 27640684.

Almost surely, 2^221125444 is an apocalyptic number.

It is an amenable number.

221125444 is a deficient number, since it is larger than the sum of its proper divisors (165844090).

221125444 is a wasteful number, since it uses less digits than its factorization.

221125444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55281365 (or 55281363 counting only the distinct ones).

The product of its digits is 2560, while the sum is 25.

The square root of 221125444 is about 14870.2872870701. The cubic root of 221125444 is about 604.7087312293.

Adding to 221125444 its reverse (444521122), we get a palindrome (665646566).

It can be divided in two parts, 22112 and 5444, that added together give a square (27556 = 166²).

The spelling of 221125444 in words is "two hundred twenty-one million, one hundred twenty-five thousand, four hundred forty-four".