221665230 has 48 divisors (see below), whose sum is σ = 584241840. Its totient is φ = 58299264.

The previous prime is 221665219. The next prime is 221665243. The reversal of 221665230 is 32566122.

221665230 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 652 + 3 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 221665194 and 221665203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10300 + ... + 23439.

It is an arithmetic number, because the mean of its divisors is an integer number (12171705).

Almost surely, 2^221665230 is an apocalyptic number.

221665230 is an abundant number, since it is smaller than the sum of its proper divisors (362576610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221665230 is a wasteful number, since it uses less digits than its factorization.

221665230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33825 (or 33822 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 221665230 is about 14888.4260417278. The cubic root of 221665230 is about 605.2003798610.

The spelling of 221665230 in words is "two hundred twenty-one million, six hundred sixty-five thousand, two hundred thirty".