221200220 has 24 divisors (see below), whose sum is σ = 470886864. Its totient is φ = 87267456.

The previous prime is 221200211. The next prime is 221200249. The reversal of 221200220 is 22002122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74294 + ... + 77213.

It is an arithmetic number, because the mean of its divisors is an integer number (19620286).

Almost surely, 2^221200220 is an apocalyptic number.

221200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200220 is an abundant number, since it is smaller than the sum of its proper divisors (249686644).

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

221200220 is a wasteful number, since it uses less digits than its factorization.

221200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151589 (or 151587 counting only the distinct ones).

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

The square root of 221200220 is about 14872.8013501156. The cubic root of 221200220 is about 604.7768865160.

Adding to 221200220 its reverse (22002122), we get a palindrome (243202342).

The spelling of 221200220 in words is "two hundred twenty-one million, two hundred thousand, two hundred twenty".