21331131103 has 4 divisors (see below), whose sum is σ = 21331447200. Its totient is φ = 21330815008.

The previous prime is 21331131083. The next prime is 21331131113. The reversal of 21331131103 is 30113113312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331131103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331131113) 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, 11575 + ... + 206872.

It is an arithmetic number, because the mean of its divisors is an integer number (5332861800).

Almost surely, 2^21331131103 is an apocalyptic number.

21331131103 is a deficient number, since it is larger than the sum of its proper divisors (316097).

21331131103 is an equidigital number, since it uses as much as digits as its factorization.

21331131103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316096.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21331131103 its reverse (30113113312), we get a palindrome (51444244415).

The spelling of 21331131103 in words is "twenty-one billion, three hundred thirty-one million, one hundred thirty-one thousand, one hundred three".