21033100133 has 4 divisors (see below), whose sum is σ = 21038345388. Its totient is φ = 21027854880.

The previous prime is 21033100093. The next prime is 21033100159. The reversal of 21033100133 is 33100133012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17456222884 + 3576877249 = 132122^2 + 59807^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033100133 - 2³² = 16738132837 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 (21033100433) 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 3 ways as a sum of consecutive naturals, for example, 2616608 + ... + 2624633.

It is an arithmetic number, because the mean of its divisors is an integer number (5259586347).

Almost surely, 2^21033100133 is an apocalyptic number.

It is an amenable number.

21033100133 is a deficient number, since it is larger than the sum of its proper divisors (5245255).

21033100133 is an equidigital number, since it uses as much as digits as its factorization.

21033100133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5245254.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21033100133 its reverse (33100133012), we get a palindrome (54133233145).

The spelling of 21033100133 in words is "twenty-one billion, thirty-three million, one hundred thousand, one hundred thirty-three".