221334224 has 10 divisors (see below), whose sum is σ = 428835090. Its totient is φ = 110667104.

The previous prime is 221334209. The next prime is 221334257. The reversal of 221334224 is 422433122.

It can be written as a sum of positive squares in only one way, i.e., 197908624 + 23425600 = 14068^2 + 4840^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221334224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6916679 + ... + 6916710.

It is an arithmetic number, because the mean of its divisors is an integer number (42883509).

Almost surely, 2^221334224 is an apocalyptic number.

It is an amenable number.

221334224 is a deficient number, since it is larger than the sum of its proper divisors (207500866).

221334224 is a wasteful number, since it uses less digits than its factorization.

221334224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13833397 (or 13833391 counting only the distinct ones).

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

The square root of 221334224 is about 14877.3056700466. The cubic root of 221334224 is about 604.8989873019.

Adding to 221334224 its reverse (422433122), we get a palindrome (643767346).

The spelling of 221334224 in words is "two hundred twenty-one million, three hundred thirty-four thousand, two hundred twenty-four".