2121013221 has 8 divisors (see below), whose sum is σ = 2828288160. Its totient is φ = 1413873552.

The previous prime is 2121013199. The next prime is 2121013253. The reversal of 2121013221 is 1223101212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121013221 - 2⁹ = 2121012709 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121013221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121013021) 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 7 ways as a sum of consecutive naturals, for example, 11415 + ... + 66123.

It is an arithmetic number, because the mean of its divisors is an integer number (353536020).

Almost surely, 2^2121013221 is an apocalyptic number.

It is an amenable number.

2121013221 is a deficient number, since it is larger than the sum of its proper divisors (707274939).

2121013221 is a wasteful number, since it uses less digits than its factorization.

2121013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67635.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2121013221 is about 46054.4592954906. The cubic root of 2121013221 is about 1284.8362816850.

Adding to 2121013221 its reverse (1223101212), we get a palindrome (3344114433).

The spelling of 2121013221 in words is "two billion, one hundred twenty-one million, thirteen thousand, two hundred twenty-one".