221055220 has 24 divisors (see below), whose sum is σ = 464637600. Its totient is φ = 88341792.

The previous prime is 221055181. The next prime is 221055223. The reversal of 221055220 is 22550122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221055223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20791 + ... + 29569.

It is an arithmetic number, because the mean of its divisors is an integer number (19359900).

Almost surely, 2^221055220 is an apocalyptic number.

221055220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221055220 is an abundant number, since it is smaller than the sum of its proper divisors (243582380).

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

221055220 is a wasteful number, since it uses less digits than its factorization.

221055220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10047 (or 10045 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 221055220 is about 14867.9258809022. The cubic root of 221055220 is about 604.6447109139.

The spelling of 221055220 in words is "two hundred twenty-one million, fifty-five thousand, two hundred twenty".