221220200 has 24 divisors (see below), whose sum is σ = 514337430. Its totient is φ = 88488000.

The previous prime is 221220163. The next prime is 221220229. The reversal of 221220200 is 2022122.

It can be written as a sum of positive squares in 3 ways, for example, as 122456356 + 98763844 = 11066^2 + 9938^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 552851 + ... + 553250.

Almost surely, 2^221220200 is an apocalyptic number.

221220200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220200 is an abundant number, since it is smaller than the sum of its proper divisors (293117230).

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

221220200 is a wasteful number, since it uses less digits than its factorization.

221220200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106117 (or 1106108 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 221220200 is about 14873.4730308694. The cubic root of 221220200 is about 604.7950948740.

Adding to 221220200 its reverse (2022122), we get a palindrome (223242322).

The spelling of 221220200 in words is "two hundred twenty-one million, two hundred twenty thousand, two hundred".