2011321220 has 12 divisors (see below), whose sum is σ = 4223774604. Its totient is φ = 804528480.

The previous prime is 2011321211. The next prime is 2011321223. The reversal of 2011321220 is 221231102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 301994884 + 1709326336 = 17378^2 + 41344^2 .

It is a super-3 number, since 3×2011321220³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2011321195 and 2011321204.

It is not an unprimeable number, because it can be changed into a prime (2011321223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50283011 + ... + 50283050.

It is an arithmetic number, because the mean of its divisors is an integer number (351981217).

Almost surely, 2^2011321220 is an apocalyptic number.

2011321220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011321220 is an abundant number, since it is smaller than the sum of its proper divisors (2212453384).

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

2011321220 is a wasteful number, since it uses less digits than its factorization.

2011321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100566070 (or 100566068 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2011321220 is about 44847.7560196717. The cubic root of 2011321220 is about 1262.2938855100.

Adding to 2011321220 its reverse (221231102), we get a palindrome (2232552322).

The spelling of 2011321220 in words is "two billion, eleven million, three hundred twenty-one thousand, two hundred twenty".