21011320112003 has 4 divisors (see below), whose sum is σ = 22627575505248. Its totient is φ = 19395064718760.

The previous prime is 21011320111987. The next prime is 21011320112087. The reversal of 21011320112003 is 30021102311012.

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

It is a cyclic number.

It is not a de Polignac number, because 21011320112003 - 2⁴ = 21011320111987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011320118003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808127696603 + ... + 808127696628.

It is an arithmetic number, because the mean of its divisors is an integer number (5656893876312).

Almost surely, 2^{21011320112003} is an apocalyptic number.

21011320112003 is a deficient number, since it is larger than the sum of its proper divisors (1616255393245).

21011320112003 is a wasteful number, since it uses less digits than its factorization.

21011320112003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616255393244.

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

Adding to 21011320112003 its reverse (30021102311012), we get a palindrome (51032422423015).

The spelling of 21011320112003 in words is "twenty-one trillion, eleven billion, three hundred twenty million, one hundred twelve thousand, three".