21133313103 has 16 divisors (see below), whose sum is σ = 33898046720. Its totient is φ = 11440590336.

The previous prime is 21133313083. The next prime is 21133313137. The reversal of 21133313103 is 30131333112.

It is not a de Polignac number, because 21133313103 - 2⁶ = 21133313039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 21133313103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133313143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26482450 + ... + 26483247.

It is an arithmetic number, because the mean of its divisors is an integer number (2118627920).

Almost surely, 2^21133313103 is an apocalyptic number.

21133313103 is a deficient number, since it is larger than the sum of its proper divisors (12764733617).

21133313103 is a wasteful number, since it uses less digits than its factorization.

21133313103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52965726.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 21133313103 its reverse (30131333112), we get a palindrome (51264646215).

The spelling of 21133313103 in words is "twenty-one billion, one hundred thirty-three million, three hundred thirteen thousand, one hundred three".