21103101133 has 4 divisors (see below), whose sum is σ = 21103409340. Its totient is φ = 21102792928.

The previous prime is 21103101077. The next prime is 21103101137. The reversal of 21103101133 is 33110130112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14791910884 + 6311190249 = 121622^2 + 79443^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103101133 - 2²¹ = 21101003981 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 (21103101137) 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, 88 + ... + 205441.

It is an arithmetic number, because the mean of its divisors is an integer number (5275852335).

Almost surely, 2^21103101133 is an apocalyptic number.

It is an amenable number.

21103101133 is a deficient number, since it is larger than the sum of its proper divisors (308207).

21103101133 is a wasteful number, since it uses less digits than its factorization.

21103101133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308206.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21103101133 its reverse (33110130112), we get a palindrome (54213231245).

The spelling of 21103101133 in words is "twenty-one billion, one hundred three million, one hundred one thousand, one hundred thirty-three".