2012321220 has 288 divisors, whose sum is σ = 7254471168. Its totient is φ = 412812288.

The previous prime is 2012321219. The next prime is 2012321231. The reversal of 2012321220 is 221232102.

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 2012321220.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1413429 + ... + 1414851.

It is an arithmetic number, because the mean of its divisors is an integer number (25189136).

Almost surely, 2^2012321220 is an apocalyptic number.

2012321220 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 2012321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3627235584).

2012321220 is an abundant number, since it is smaller than the sum of its proper divisors (5242149948).

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

2012321220 is a wasteful number, since it uses less digits than its factorization.

2012321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1490 counting only the distinct ones).

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

The square root of 2012321220 is about 44858.9034640839. The cubic root of 2012321220 is about 1262.5030489748.

Adding to 2012321220 its reverse (221232102), we get a palindrome (2233553322).

The spelling of 2012321220 in words is "two billion, twelve million, three hundred twenty-one thousand, two hundred twenty".