2121320220 has 48 divisors (see below), whose sum is σ = 6040379520. Its totient is φ = 556096576.

The previous prime is 2121320209. The next prime is 2121320233. The reversal of 2121320220 is 220231212.

It is a happy number.

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

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 2121320220.

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, 296082 + ... + 303161.

It is an arithmetic number, because the mean of its divisors is an integer number (125841240).

Almost surely, 2^2121320220 is an apocalyptic number.

2121320220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121320220 is an abundant number, since it is smaller than the sum of its proper divisors (3919059300).

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

2121320220 is a wasteful number, since it uses less digits than its factorization.

2121320220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599314 (or 599312 counting only the distinct ones).

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

The square root of 2121320220 is about 46057.7921746147. The cubic root of 2121320220 is about 1284.8982684784.

Adding to 2121320220 its reverse (220231212), we get a palindrome (2341551432).

The spelling of 2121320220 in words is "two billion, one hundred twenty-one million, three hundred twenty thousand, two hundred twenty".