2121333321 has 32 divisors (see below), whose sum is σ = 3133945728. Its totient is φ = 1270563840.

The previous prime is 2121333301. The next prime is 2121333329. The reversal of 2121333321 is 1233331212.

It is not a de Polignac number, because 2121333321 - 2¹⁸ = 2121071177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121333329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89406 + ... + 110616.

It is an arithmetic number, because the mean of its divisors is an integer number (97935804).

Almost surely, 2^2121333321 is an apocalyptic number.

It is an amenable number.

2121333321 is a deficient number, since it is larger than the sum of its proper divisors (1012612407).

2121333321 is a wasteful number, since it uses less digits than its factorization.

2121333321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21321.

The product of its digits is 648, while the sum is 21.

The square root of 2121333321 is about 46057.9343978863. The cubic root of 2121333321 is about 1284.9009135949.

Adding to 2121333321 its reverse (1233331212), we get a palindrome (3354664533).

The spelling of 2121333321 in words is "two billion, one hundred twenty-one million, three hundred thirty-three thousand, three hundred twenty-one".