221450216 has 16 divisors (see below), whose sum is σ = 447159300. Its totient is φ = 102207744.

The previous prime is 221450189. The next prime is 221450221. The reversal of 221450216 is 612054122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 219336100 + 2114116 = 14810^2 + 1454^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221450191 and 221450200.

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, 1064561 + ... + 1064768.

Almost surely, 2^221450216 is an apocalyptic number.

221450216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221450216 is an abundant number, since it is smaller than the sum of its proper divisors (225709084).

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

221450216 is a wasteful number, since it uses less digits than its factorization.

221450216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129348 (or 2129344 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 221450216 is about 14881.2034459583. The cubic root of 221450216 is about 605.0046362598.

The spelling of 221450216 in words is "two hundred twenty-one million, four hundred fifty thousand, two hundred sixteen".