2121001103321 has 4 divisors (see below), whose sum is σ = 2122123922100. Its totient is φ = 2119878284544.

The previous prime is 2121001103297. The next prime is 2121001103339. The reversal of 2121001103321 is 1233011001212.

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 1528969345225 + 592031758096 = 1236515^2 + 769436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121001103321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121001103321.

It is not an unprimeable number, because it can be changed into a prime (2121001106321) 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, 561406556 + ... + 561410333.

It is an arithmetic number, because the mean of its divisors is an integer number (530530980525).

Almost surely, 2^{2121001103321} is an apocalyptic number.

It is an amenable number.

2121001103321 is a deficient number, since it is larger than the sum of its proper divisors (1122818779).

2121001103321 is a wasteful number, since it uses less digits than its factorization.

2121001103321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122818778.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 2121001103321 its reverse (1233011001212), we get a palindrome (3354012104533).

The spelling of 2121001103321 in words is "two trillion, one hundred twenty-one billion, one million, one hundred three thousand, three hundred twenty-one".