2121022321 has 8 divisors (see below), whose sum is σ = 2336753088. Its totient is φ = 1909110000.

The previous prime is 2121022261. The next prime is 2121022327. The reversal of 2121022321 is 1232201212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121022321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121022295 and 2121022304.

It is not an unprimeable number, because it can be changed into a prime (2121022327) 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, 953445 + ... + 955666.

It is an arithmetic number, because the mean of its divisors is an integer number (292094136).

Almost surely, 2^2121022321 is an apocalyptic number.

It is an amenable number.

2121022321 is a deficient number, since it is larger than the sum of its proper divisors (215730767).

2121022321 is a wasteful number, since it uses less digits than its factorization.

2121022321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909223.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2121022321 is about 46054.5580914637. The cubic root of 2121022321 is about 1284.8381191706.

Adding to 2121022321 its reverse (1232201212), we get a palindrome (3353223533).

The spelling of 2121022321 in words is "two billion, one hundred twenty-one million, twenty-two thousand, three hundred twenty-one".