2121303220 has 24 divisors (see below), whose sum is σ = 4466695464. Its totient is φ = 846243456.

The previous prime is 2121303211. The next prime is 2121303227. The reversal of 2121303220 is 223031212.

It can be written as a sum of positive squares in 4 ways, for example, as 24029604 + 2097273616 = 4902^2 + 45796^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2121303194 and 2121303203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121303227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134719 + ... + 149638.

It is an arithmetic number, because the mean of its divisors is an integer number (186112311).

Almost surely, 2^2121303220 is an apocalyptic number.

2121303220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121303220 is an abundant number, since it is smaller than the sum of its proper divisors (2345392244).

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

2121303220 is a wasteful number, since it uses less digits than its factorization.

2121303220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284739 (or 284737 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2121303220 is about 46057.6076234969. The cubic root of 2121303220 is about 1284.8948361302.

Adding to 2121303220 its reverse (223031212), we get a palindrome (2344334432).

The spelling of 2121303220 in words is "two billion, one hundred twenty-one million, three hundred three thousand, two hundred twenty".