2011223220 has 48 divisors (see below), whose sum is σ = 5689497408. Its totient is φ = 530795520.

The previous prime is 2011223213. The next prime is 2011223237. The reversal of 2011223220 is 223221102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2011223220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166966 + ... + 178605.

It is an arithmetic number, because the mean of its divisors is an integer number (118531196).

Almost surely, 2^2011223220 is an apocalyptic number.

2011223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011223220 is an abundant number, since it is smaller than the sum of its proper divisors (3678274188).

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

2011223220 is a wasteful number, since it uses less digits than its factorization.

2011223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345680 (or 345678 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2011223220 is about 44846.6634210395. The cubic root of 2011223220 is about 1262.2733837608.

Adding to 2011223220 its reverse (223221102), we get a palindrome (2234444322).

The spelling of 2011223220 in words is "two billion, eleven million, two hundred twenty-three thousand, two hundred twenty".