21320104221 has 48 divisors (see below), whose sum is σ = 34166146560. Its totient is φ = 12726046080.

The previous prime is 21320104189. The next prime is 21320104249. The reversal of 21320104221 is 12240102312.

It is a happy number.

21320104221 is a `hidden beast` number, since 21 + 320 + 104 + 221 = 666.

It is not a de Polignac number, because 21320104221 - 2⁵ = 21320104189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21320104194 and 21320104203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320104121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1425460 + ... + 1440338.

It is an arithmetic number, because the mean of its divisors is an integer number (711794720).

Almost surely, 2^21320104221 is an apocalyptic number.

It is an amenable number.

21320104221 is a deficient number, since it is larger than the sum of its proper divisors (12846042339).

21320104221 is a wasteful number, since it uses less digits than its factorization.

21320104221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15266 (or 15263 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21320104221 its reverse (12240102312), we get a palindrome (33560206533).

The spelling of 21320104221 in words is "twenty-one billion, three hundred twenty million, one hundred four thousand, two hundred twenty-one".