221830864 has 20 divisors (see below), whose sum is σ = 437908356. Its totient is φ = 108822272.

The previous prime is 221830793. The next prime is 221830877. The reversal of 221830864 is 468038122.

It can be written as a sum of positive squares in 2 ways, for example, as 135489600 + 86341264 = 11640^2 + 9292^2 .

It is a congruent number.

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, 129949 + ... + 131644.

Almost surely, 2^221830864 is an apocalyptic number.

It is an amenable number.

221830864 is a deficient number, since it is larger than the sum of its proper divisors (216077492).

221830864 is a wasteful number, since it uses less digits than its factorization.

221830864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261654 (or 261648 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 221830864 is about 14893.9875117445. The cubic root of 221830864 is about 605.3510827962.

Adding to 221830864 its reverse (468038122), we get a palindrome (689868986).

The spelling of 221830864 in words is "two hundred twenty-one million, eight hundred thirty thousand, eight hundred sixty-four".