2121332110321 has 16 divisors (see below), whose sum is σ = 2212658007120. Its totient is φ = 2032470835200.

The previous prime is 2121332110319. The next prime is 2121332110361. The reversal of 2121332110321 is 1230112331212.

It can be written as a sum of positive squares in 8 ways, for example, as 1077369265296 + 1043962845025 = 1037964^2 + 1021745^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121332110321 - 2¹ = 2121332110319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121332110292 and 2121332110301.

It is not an unprimeable number, because it can be changed into a prime (2121332110301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2323536 + ... + 3105073.

It is an arithmetic number, because the mean of its divisors is an integer number (138291125445).

Almost surely, 2^{2121332110321} is an apocalyptic number.

It is an amenable number.

2121332110321 is a deficient number, since it is larger than the sum of its proper divisors (91325896799).

2121332110321 is a wasteful number, since it uses less digits than its factorization.

2121332110321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428836.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 2121332110321 its reverse (1230112331212), we get a palindrome (3351444441533).

The spelling of 2121332110321 in words is "two trillion, one hundred twenty-one billion, three hundred thirty-two million, one hundred ten thousand, three hundred twenty-one".