2121330221 has 12 divisors (see below), whose sum is σ = 2243827872. Its totient is φ = 2005218504.

The previous prime is 2121330187. The next prime is 2121330229. The reversal of 2121330221 is 1220331212.

It is not a de Polignac number, because 2121330221 - 2⁶ = 2121330157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121330221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121330229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162296 + ... + 174878.

It is an arithmetic number, because the mean of its divisors is an integer number (186985656).

Almost surely, 2^2121330221 is an apocalyptic number.

It is an amenable number.

2121330221 is a deficient number, since it is larger than the sum of its proper divisors (122497651).

2121330221 is a wasteful number, since it uses less digits than its factorization.

2121330221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13088 (or 13069 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2121330221 is about 46057.9007446062. The cubic root of 2121330221 is about 1284.9002877000.

Adding to 2121330221 its reverse (1220331212), we get a palindrome (3341661433).

Subtracting from 2121330221 its reverse (1220331212), we obtain a palindrome (900999009).

The spelling of 2121330221 in words is "two billion, one hundred twenty-one million, three hundred thirty thousand, two hundred twenty-one".