221033444 has 6 divisors (see below), whose sum is σ = 386808534. Its totient is φ = 110516720.

The previous prime is 221033429. The next prime is 221033453. The reversal of 221033444 is 444330122.

It can be written as a sum of positive squares in only one way, i.e., 128142400 + 92891044 = 11320^2 + 9638^2 .

It is a super-2 number, since 2×221033444² = 97711566733002272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27629177 + ... + 27629184.

It is an arithmetic number, because the mean of its divisors is an integer number (64468089).

Almost surely, 2^221033444 is an apocalyptic number.

It is an amenable number.

221033444 is a deficient number, since it is larger than the sum of its proper divisors (165775090).

221033444 is a wasteful number, since it uses less digits than its factorization.

221033444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55258365 (or 55258363 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 221033444 is about 14867.1935482121. The cubic root of 221033444 is about 604.6248558816.

Adding to 221033444 its reverse (444330122), we get a palindrome (665363566).

The spelling of 221033444 in words is "two hundred twenty-one million, thirty-three thousand, four hundred forty-four".