221203220 has 24 divisors (see below), whose sum is σ = 530888064. Its totient is φ = 75841056.

The previous prime is 221203219. The next prime is 221203249. The reversal of 221203220 is 22302122.

221203220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 221203195 and 221203204.

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, 789872 + ... + 790151.

It is an arithmetic number, because the mean of its divisors is an integer number (22120336).

Almost surely, 2^221203220 is an apocalyptic number.

221203220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221203220 is an abundant number, since it is smaller than the sum of its proper divisors (309684844).

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

221203220 is a wasteful number, since it uses less digits than its factorization.

221203220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580039 (or 1580037 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 221203220 is about 14872.9022050170. The cubic root of 221203220 is about 604.7796205737.

Adding to 221203220 its reverse (22302122), we get a palindrome (243505342).

The spelling of 221203220 in words is "two hundred twenty-one million, two hundred three thousand, two hundred twenty".