21103120100221 has 8 divisors (see below), whose sum is σ = 21147439812224. Its totient is φ = 21058804433520.

The previous prime is 21103120100159. The next prime is 21103120100281. The reversal of 21103120100221 is 12200102130112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21103120100221 - 2¹¹ = 21103120098173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103120100195 and 21103120100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103120100281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9548656 + ... + 11549158.

It is an arithmetic number, because the mean of its divisors is an integer number (2643429976528).

Almost surely, 2^{21103120100221} is an apocalyptic number.

It is an amenable number.

21103120100221 is a deficient number, since it is larger than the sum of its proper divisors (44319712003).

21103120100221 is a wasteful number, since it uses less digits than its factorization.

21103120100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022651.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21103120100221 its reverse (12200102130112), we get a palindrome (33303222230333).

The spelling of 21103120100221 in words is "twenty-one trillion, one hundred three billion, one hundred twenty million, one hundred thousand, two hundred twenty-one".