2121303011321 has 4 divisors (see below), whose sum is σ = 2284480166052. Its totient is φ = 1958125856592.

The previous prime is 2121303011251. The next prime is 2121303011327. The reversal of 2121303011321 is 1231103031212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 850747969600 + 1270555041721 = 922360^2 + 1127189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121303011321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121303011293 and 2121303011302.

It is not an unprimeable number, because it can be changed into a prime (2121303011327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81588577346 + ... + 81588577371.

It is an arithmetic number, because the mean of its divisors is an integer number (571120041513).

Almost surely, 2^{2121303011321} is an apocalyptic number.

It is an amenable number.

2121303011321 is a deficient number, since it is larger than the sum of its proper divisors (163177154731).

2121303011321 is a wasteful number, since it uses less digits than its factorization.

2121303011321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163177154730.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 2121303011321 its reverse (1231103031212), we get a palindrome (3352406042533).

The spelling of 2121303011321 in words is "two trillion, one hundred twenty-one billion, three hundred three million, eleven thousand, three hundred twenty-one".