2121320203321 has 4 divisors (see below), whose sum is σ = 2314167494544. Its totient is φ = 1928472912100.

The previous prime is 2121320203187. The next prime is 2121320203333. The reversal of 2121320203321 is 1233020231212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121320203321 - 2¹³ = 2121320195129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121320203292 and 2121320203301.

It is not an unprimeable number, because it can be changed into a prime (2121320203351) 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, 96423645595 + ... + 96423645616.

It is an arithmetic number, because the mean of its divisors is an integer number (578541873636).

Almost surely, 2^{2121320203321} is an apocalyptic number.

It is an amenable number.

2121320203321 is a deficient number, since it is larger than the sum of its proper divisors (192847291223).

2121320203321 is a wasteful number, since it uses less digits than its factorization.

2121320203321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192847291222.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 2121320203321 its reverse (1233020231212), we get a palindrome (3354340434533).

The spelling of 2121320203321 in words is "two trillion, one hundred twenty-one billion, three hundred twenty million, two hundred three thousand, three hundred twenty-one".