21104010221 has 4 divisors (see below), whose sum is σ = 24118868832. Its totient is φ = 18089151612.

The previous prime is 21104010217. The next prime is 21104010253. The reversal of 21104010221 is 12201040112.

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 not a de Polignac number, because 21104010221 - 2² = 21104010217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21104010196 and 21104010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104010211) 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, 1507429295 + ... + 1507429308.

It is an arithmetic number, because the mean of its divisors is an integer number (6029717208).

Almost surely, 2^21104010221 is an apocalyptic number.

It is an amenable number.

21104010221 is a deficient number, since it is larger than the sum of its proper divisors (3014858611).

21104010221 is an equidigital number, since it uses as much as digits as its factorization.

21104010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014858610.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21104010221 its reverse (12201040112), we get a palindrome (33305050333).

The spelling of 21104010221 in words is "twenty-one billion, one hundred four million, ten thousand, two hundred twenty-one".