2121304220 has 48 divisors (see below), whose sum is σ = 5094048960. Its totient is φ = 726887424.

The previous prime is 2121304201. The next prime is 2121304223. The reversal of 2121304220 is 224031212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121304223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335246 + ... + 341514.

It is an arithmetic number, because the mean of its divisors is an integer number (106126020).

Almost surely, 2^2121304220 is an apocalyptic number.

2121304220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121304220 is an abundant number, since it is smaller than the sum of its proper divisors (2972744740).

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

2121304220 is a wasteful number, since it uses less digits than its factorization.

2121304220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8702 (or 8700 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2121304220 is about 46057.6184794655. The cubic root of 2121304220 is about 1284.8950380335.

Adding to 2121304220 its reverse (224031212), we get a palindrome (2345335432).

The spelling of 2121304220 in words is "two billion, one hundred twenty-one million, three hundred four thousand, two hundred twenty".