21104220133 has 4 divisors (see below), whose sum is σ = 21371362240. Its totient is φ = 20837078028.

The previous prime is 21104220107. The next prime is 21104220143. The reversal of 21104220133 is 33102240112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21104220133 - 2⁹ = 21104219621 is a prime.

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 21104220133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104220103) 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, 133570935 + ... + 133571092.

It is an arithmetic number, because the mean of its divisors is an integer number (5342840560).

Almost surely, 2^21104220133 is an apocalyptic number.

It is an amenable number.

21104220133 is a deficient number, since it is larger than the sum of its proper divisors (267142107).

21104220133 is an equidigital number, since it uses as much as digits as its factorization.

21104220133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267142106.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21104220133 its reverse (33102240112), we get a palindrome (54206460245).

The spelling of 21104220133 in words is "twenty-one billion, one hundred four million, two hundred twenty thousand, one hundred thirty-three".