2223221220 has 144 divisors (see below), whose sum is σ = 7555923648. Its totient is φ = 524378880.

The previous prime is 2223221219. The next prime is 2223221237. The reversal of 2223221220 is 221223222.

2223221220 is a `hidden beast` number, since 2 + 223 + 221 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2223221193 and 2223221202.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 58087 + ... + 88433.

It is an arithmetic number, because the mean of its divisors is an integer number (52471692).

Almost surely, 2^2223221220 is an apocalyptic number.

2223221220 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 2223221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3777961824).

2223221220 is an abundant number, since it is smaller than the sum of its proper divisors (5332702428).

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

2223221220 is a wasteful number, since it uses less digits than its factorization.

2223221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30410 (or 30405 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 2223221220 is about 47151.0468600645. The cubic root of 2223221220 is about 1305.1513982979.

Adding to 2223221220 its reverse (221223222), we get a palindrome (2444444442).

The spelling of 2223221220 in words is "two billion, two hundred twenty-three million, two hundred twenty-one thousand, two hundred twenty".