223221220 has 96 divisors (see below), whose sum is σ = 518192640. Its totient is φ = 80424960.

The previous prime is 223221161. The next prime is 223221227. The reversal of 223221220 is 22122322.

223221220 is digitally balanced in base 2, base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×223221220³ (a number of 26 digits) contains 333 as substring.

223221220 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 223221194 and 223221203.

It is not an unprimeable number, because it can be changed into a prime (223221227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 933861 + ... + 934099.

It is an arithmetic number, because the mean of its divisors is an integer number (5397840).

Almost surely, 2^223221220 is an apocalyptic number.

223221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 223221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259096320).

223221220 is an abundant number, since it is smaller than the sum of its proper divisors (294971420).

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

223221220 is a wasteful number, since it uses less digits than its factorization.

223221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 223221220 is about 14940.5896804644. The cubic root of 223221220 is about 606.6131572711.

Adding to 223221220 its reverse (22122322), we get a palindrome (245343542).

The spelling of 223221220 in words is "two hundred twenty-three million, two hundred twenty-one thousand, two hundred twenty".