21311103133 has 8 divisors (see below), whose sum is σ = 22684795200. Its totient is φ = 19962616608.

The previous prime is 21311103127. The next prime is 21311103137. The reversal of 21311103133 is 33130111312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21311103133 - 2⁵ = 21311103101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 21311103133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311103137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6299641 + ... + 6303022.

It is an arithmetic number, because the mean of its divisors is an integer number (2835599400).

Almost surely, 2^21311103133 is an apocalyptic number.

It is an amenable number.

21311103133 is a deficient number, since it is larger than the sum of its proper divisors (1373692067).

21311103133 is a wasteful number, since it uses less digits than its factorization.

21311103133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12602771.

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

Adding to 21311103133 its reverse (33130111312), we get a palindrome (54441214445).

The spelling of 21311103133 in words is "twenty-one billion, three hundred eleven million, one hundred three thousand, one hundred thirty-three".