21011113330321 has 4 divisors (see below), whose sum is σ = 21031335769600. Its totient is φ = 20990890891044.

The previous prime is 21011113330313. The next prime is 21011113330387. The reversal of 21011113330321 is 12303331111012.

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 21011113330321 - 2³ = 21011113330313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011113330292 and 21011113330301.

It is not an unprimeable number, because it can be changed into a prime (21011113330621) 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, 10111218081 + ... + 10111220158.

It is an arithmetic number, because the mean of its divisors is an integer number (5257833942400).

Almost surely, 2^{21011113330321} is an apocalyptic number.

It is an amenable number.

21011113330321 is a deficient number, since it is larger than the sum of its proper divisors (20222439279).

21011113330321 is a wasteful number, since it uses less digits than its factorization.

21011113330321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20222439278.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 21011113330321 its reverse (12303331111012), we get a palindrome (33314444441333).

The spelling of 21011113330321 in words is "twenty-one trillion, eleven billion, one hundred thirteen million, three hundred thirty thousand, three hundred twenty-one".